*retin*

n. [ F. crétinisme. ] A condition of endemic or inherited idiocy, accompanied by physical degeneracy and deformity (usually with goiter), frequent in certain mountain valleys, esp. of the Alps. [ 1913 Webster ]

a. Having the characteristics of a cretin. “Cretinous stupefaction.” Ruskin. [ 1913 Webster ]

n. [ From Excrete. ] (physiol. Chem.) A nonnitrogenous, crystalline body, present in small quantity in human fæces. [ 1913 Webster ]

n. Small splinters of stone inserted into the joints of coarse masonry. Weale. [ 1913 Webster ]

n. (Chem.) A white, crystalline substance having a sweetish taste, obtained by the decomposition of hesperidin, and regarded as a complex derivative of caffeic acid. [ 1913 Webster ]

n. [ Indian + Gr. &unr_; resin. ] (Chem.) A dark brown resinous substance obtained from indican. [ 1913 Webster ]

n. [ From Phlorizin. ] (Chem.) A bitter white crystalline substance obtained by the decomposition of phlorizin, and formerly used to some extent as a substitute for quinine. [ 1913 Webster ]

n. [ NL., from L. rete a net. Cf. Reticule. ] (Anat.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye. [ 1913 Webster ]

☞ The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat. [ 1913 Webster ]

‖n.; pl. Retinacula [ L., a holdfast, a band. See Retain. ] 1. (Anat.) (a) A connecting band; a fraenum; as, the retinacula of the ileocaecal and ileocolic valves. (b) One of the annular ligaments which hold the tendons close to the bones at the larger joints, as at the wrist and ankle. [ 1913 Webster ]

2. (Zool.) One of the retractor muscles of the proboscis of certain worms. [ 1913 Webster ]

3. (Bot.) A small gland or process to which bodies are attached; as, the glandular retinacula to which the pollinia of orchids are attached, or the hooks which support the seeds in many acanthaceous plants. [ 1913 Webster ]

a. (Anat.) Of or pertaining to the retina. [ 1913 Webster ]

Retinal purple (Physiol. Chem.), the visual purple. [ 1913 Webster ]

n. (Chem.) A retinoid compound (C20H28O), closely related to vitamin A, which is a component of the visual pigments in the eye. It is also called retinaldehyde and vitamin A aldehyde. [ PJC ]

n. [ Gr. &unr_;&unr_;&unr_;&unr_; resin + -lite. ] (Min.) A translucent variety of serpentine, of a honey yellow or greenish yellow color, having a waxy resinlike luster. [ 1913 Webster ]

{ ‖ } n. [ Gr. &unr_;&unr_;&unr_;&unr_; resin + &unr_;&unr_;&unr_;&unr_;&unr_; asphalt. ] (Min.) Retinite. [ 1913 Webster ]

a. [ L. rete a net + E. nerve. ] (Bot.) Having reticulated veins. [ 1913 Webster ]

‖n.; pl. Retinea [ NL. See Retina. ] (Zool.) That part of the eye of an invertebrate which corresponds in function with the retina of a vertebrate. [ 1913 Webster ]

a. [ Gr. &unr_;&unr_;&unr_;&unr_; resin. ] (Min. Chem.) Of or pertaining to resin; derived from resin; specifically, designating an acid found in certain fossil resins and hydrocarbons. [ 1913 Webster ]

n. [ Gr.&unr_;&unr_;&unr_; resin: cf. F. rétinite. ] (Min.) An inflammable mineral resin, usually of a yellowish brown color, found in roundish masses, sometimes with coal. [ 1913 Webster ]

n. [ NL., fr. NL. & E. retina + -tis. ] (Med.) Inflammation of the retina. [ 1913 Webster ]

n. (Chem.) A retinoid compound (C20H28O2), closely related to vitamin A. It is also called tretinoin and vitamin A acid. [ PJC ]

a. [ Gr. &unr_;&unr_;&unr_; resin + -oid. ] Resinlike, or resinform; resembling a resin without being such. [ 1913 Webster ]

n. [ Gr. &unr_;&unr_;&unr_; resin + L. oleum oil. ] 1. (Chem.) A hydrocarbon oil C32H16, obtained by the distillation of resin, -- used as a solvent, as an antiseptic, and in printer's ink. [ 1913 Webster +PJC ]

2. One of the compounds which function as vitamin A. Called also vitamin A, vitamin A1 and vitamin A alcohol. See vitamin A1. [ PJC ]

‖n.; pl. Retiniphorae [ NL., fr. NL. & E. retina + Gr. fe`rein to bear. ] (Zool.) One of group of two to four united cells which occupy the axial part of the ocelli, or ommatidia, of the eyes of invertebrates, and contain the terminal nerve fibrillae. See Illust. under Ommatidium. [ 1913 Webster ]

a. (Zool.) Of or pertaining to retinophorae. [ 1913 Webster ]

n. [ Retina + -scopy. ] (Physiol.) The study of the retina of the eye by means of the ophthalmoscope. [ 1913 Webster ]

n. [ OE. retinue, OF. retinue, fr. retenir to retain, engage, hire. See Retain. ] The body of retainers who follow a prince or other distinguished person; a train of attendants; a suite. [ 1913 Webster ]

Others of your insolent retinue. Shak. [ 1913 Webster ]

What followers, what retinue canst thou gain? Milton. [ 1913 Webster ]

To have at one's retinue, to keep or employ as a retainer; to retain. [ Obs. ] Chaucer. [ 1913 Webster ]

‖n.; pl. Retinulae [ NL., dim. of NL. & E. retina. ] (Zool.) One of the group of pigmented cells which surround the retinophorae of invertebrates. See Illust. under Ommatidium. [ 1913 Webster ]

a. (Zool.) Having, or characterized by, retinul&unr_;. [ 1913 Webster ]

n. [ Gr. &unr_;&unr_;&unr_; the rose + &unr_;&unr_;&unr_; resin. ] (Chem.) Same as Convolvuln. [ 1913 Webster ]

n. [ Rubian + Gr. &unr_; resin. ] (Chem.) One of the red dye products extracted from madder root, and probably identical with ruberythrinic acid. [ 1913 Webster ]