*yd*

a. [ Gr. 'a priv. + &unr_;. &unr_;. a short cloak. ] (Zool.) Not possessing a mantle; -- said of certain gastropods. [ 1913 Webster ]

a. (Bot.) Naked; having no floral envelope, neither calyx nor corolla. [ 1913 Webster ]

a. [ Aëro- + hydrodynamic. ] Acting by the force of air and water; as, an aërohydrodynamic wheel. [ 1913 Webster ]

‖ /mhw>, n. [ Sp. alcaide, fr. Ar. al-qāīd governor, fr. qāda to lead, govern. ] 1. A commander of a castle or fortress among the Spaniards, Portuguese, and Moors. [ 1913 Webster ]

2. The warden, or keeper of a jail. [ 1913 Webster ]

‖n. Same as Alcaid. [ 1913 Webster ]

n. [ Abbrev. fr. alcohol dehydrogenatum, alcohol deprived of its hydrogen. ] 1. (Chem.) A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation. [ 1913 Webster ]

2. (Chem.) Any compound having the group -CHO. Methyl aldehyde, the simplest aldehyde, is more commonly called formaldehyde, H-CHO, and acetic aldehyde is now more commonly called acetaldehyde. The higher aldehydes may be solids. A reducing sugar typically contains the aldehyde group. [ PJC ]

☞ The aldehydes are intermediate between the alcohols and acids, and differ from the alcohols in having two less hydrogen atoms in the molecule, as common aldehyde (called also acetaldehyde, acetic aldehyde or ethyl aldehyde), C2H4O; methyl aldehyde (called also formaldehyde), CH2O. [ 1913 Webster +PJC ]

Aldehyde ammonia (Chem.), a compound formed by the union of aldehyde with ammonia. [ 1913 Webster ]

a. (Chem.) Of or pertaining to aldehyde; as, aldehydic acid. Miller. [ 1913 Webster ]

n. [ See Anhydrous. ] (Chem.) An oxide of a nonmetallic body or an organic radical, capable of forming an acid by uniting with the elements of water; -- so called because it may be formed from an acid by the abstraction of water. [ 1913 Webster ]

n. [ See Anhydrous. ] (Min.) A mineral of a white or a slightly bluish color, usually massive. It is anhydrous sulphate of lime, and differs from gypsum in not containing water (whence the name). [ 1913 Webster ]

a. [ Gr. &unr_; wanting water; 'an priv. + "y`dwr water.] Destitute of water; as, anhydrous salts or acids. [1913 Webster]

a. (Med.) Counteracting or preventing hydrophobia. -- n. A remedy for hydrophobia. [ 1913 Webster ]

a. (Med.) Good against dropsy. -- n. A remedy for dropsy. [ 1913 Webster ]

n. [ Pref. bi- + hydroguret. ] (Chem.) A compound of two atoms of hydrogen with some other substance. [ Obs. ] [ 1913 Webster ]

n. A dagger; a bodkin. [ Obs. ] [ 1913 Webster ]

a. [ Gr. brachy`s short + E. diagonal. ] Pertaining to the shorter diagonal, as of a rhombic prism. [ 1913 Webster ]

Brachydiagonal axis, the shorter lateral axis of an orthorhombic crystal. [ 1913 Webster ]

n. The shorter of the diagonals in a rhombic prism. [ 1913 Webster ]

n. [ Gr. brachy`s short + E. dome. ] (Crystallog.) A dome parallel to the shorter lateral axis. See Dome. [ 1913 Webster ]

n. [ Carbon + hydrate. ] (Physiol. Chem.) One of a group of compounds including the sugars, starches, and gums, which contain six (or some multiple of six) carbon atoms, united with a variable number of hydrogen and oxygen atoms, but with the two latter always in proportion as to form water; as dextrose, C6H12O6. [ 1913 Webster ]

n. [ Carbon + hydrogen. ] (Chem.) A hydrocarbon. [ 1913 Webster ]

n. a genus of snapping turtles.
Syn. -- genus Chelydra. [ WordNet 1.5 ]

n. a natural family comprising the snapping turtles.
Syn. -- family Chelydridae. [ WordNet 1.5 ]

a. [ L. chlamydatus dressed in a military cloak. See Chlamys. ] (Zool.) Having a mantle; -- applied to certain gastropods. [ 1913 Webster ]

n. a coccoid rickettsia which may infect birds and mammals; it causes infections of eyes and lungs and the genitourinary tract. [ WordNet 1.5 ]

prop. n. A natural family of gram-negative bacteria which are parasites in warm-blooded vertebrates.
Syn. -- family Chlamydiaceae. [ WordNet 1.5 ]

prop. n. A natural family of green algae some of which are colored red by hematochrome.
Syn. -- family Chlamydomonadaceae. [ WordNet 1.5 ]

prop. n. The type genus of the Chlamydomonadaceae; they are solitary biflagellated plantlike algae common in fresh water and damp soil. They multiply freely and are often a pest around filtration plants.
Syn. -- genus Chlamydomonas. [ WordNet 1.5 ]

n. a genus of frilled lizards.
Syn. -- genus Chlamydosaurus. [ WordNet 1.5 ]

n. 1. a chemical substance (CCl3.CH(OH)2) which is a hydrate of trichloroacetaldehyde. It crystallizes as white monoclinic plates, obtained by treating chloral with water. It produces sleep when taken internally or hypodermically, and is used in medicine as a hypnotic and sedative; -- called also chloral It may be habit-forming, and is a controlled substance listed in the U. S. Code of Federal Regulations. It is sometimes used to render a person unconscious for illegal or nefarious purposes, and in this use, a concentrated solution is one of the agents called knockout drops. [ PJC ]

a. [ Chlorine + hydrogen + -ic. ] (Chem.) Same as Hydrochloric. [ 1913 Webster ]

n. (Chem.) One of a class of compounds formed from certain polybasic alcohols (and especially glycerin) by the substitution of chlorine for one or more hydroxyl groups. [ 1913 Webster ]

n. a thick-walled asexual resting spore of certain fungi and algae. [ WordNet 1.5 ]

n. [ L. from Gr. &unr_;; &unr_; to steal, conceal + &unr_; water. ] A water clock; a contrivance for measuring time by the graduated flow of a liquid, as of water, through a small aperture. See Illust. in Appendix. [ 1913 Webster ]

n. One of a breed of heavy draft horses originally from Clydesdale, Scotland. They are about sixteen hands high and usually brown or bay. [ Webster 1913 Suppl. ]

. One of a breed of small silky-haired terriers related to, but smaller than, the Skye terrier, having smaller and perfectly erect ears. [ Webster 1913 Suppl. ]

n. The region or home of cockneys; cockneys, collectively. Thackeray. [ 1913 Webster ]

n. [ Conium + hydrate. ] (Chem.) A vegetable alkaloid found with conine in the poison hemlock (Conium maculatum). It is a white crystalline substance, C8H17NO, easily convertible into conine. [ 1913 Webster ]

prop. n. A natural family of insects including the dobsonflies.
Syn. -- family Corydalidae. [ WordNet 1.5 ]

n. a plant of the genus Corydalis, with beautiful compound foliage and spurred tubular flowers. [ WordNet 1.5 +PJC ]

prop. n. The type genus of the Corydalidae. It includes the dobsonfly (Corydalus cornutus), whose aquatic larva, the hellgrammite, is used as bait in fishing.
Syn. -- genus Corydalus, genus Corydalis. [ WordNet 1.5 +PJC ]

n. the offspring of a coyote and a dog.
Syn. -- coy-dog. [ WordNet 1.5 ]

n. [ From Croydon, England. ] 1. A kind of carriage like a gig, orig. of wicker-work. [ Webster 1913 Suppl. ]

2. A kind of cotton sheeting; also, a calico. [ Webster 1913 Suppl. ]

n. [ Gr. kry`os cold + E. hydrate. ] (Chem.) A substance, as salt, ammonium chloride, etc., which crystallizes with water of crystallization only at low temperatures, or below the freezing point of water. F. Guthrie. [ 1913 Webster ]

n. See Cider. [ Archaic ] [ 1913 Webster ]

n. an order of ctenophores having two long pinnate tentacles.
Syn. -- order Cydippida, Cydippidea, order Cydippidea, Cydippea, order Cydippea. [ WordNet 1.5 ]

n. a genus of plants including the quince.
Syn. -- genus Cydonia. [ WordNet 1.5 ]

n. (Chem.) A peculiar mucilaginous substance extracted from the seeds of the quince (Cydonia vulgaris), and regarded as a variety of amylose. [ 1913 Webster ]

n. a genus of Australasian evergreen trees or shrubs.
Syn. -- genus Dacrydium. [ WordNet 1.5 ]

n. A vain fancy speculation; a reverie; a castle in the air; unfounded hope. [ 1913 Webster ]

Mrs. Lambert's little daydream was over. Thackeray. [ 1913 Webster ]