n. (Chem.) An organic base, especially one of a class of nitrogen-containing substances occurring ready formed in the tissues of plants and the bodies of animals. [ 1913 Webster ]
☞ Alkaloids all contain nitrogen, carbon, and hydrogen, and many of them also contain oxygen. They include many of the active principles in plants; thus, morphine and narcotine are alkaloids found in opium. [ 1913 Webster ]
n. (Chem.) A bitter purgative principle in aloes. [ 1913 Webster ]
n. [ Gr. &unr_; almond + -oid: cf. F. amygdaloïde. ] (Min.) A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava. [ 1913 Webster ]
a. [ Astragalus + -oid. ] (Anat.) Resembling the astragalus in form. [ 1913 Webster ]
adj.
a. [ Cephalo- + -oid. ] Shaped like the head. Craing. [ 1913 Webster ]
n. An encephaloid cancer. [ 1913 Webster ]
a. [ Gr.
Encephaloid cancer (Med.),
a. [ Gr.
a. [ Gr. &unr_; glassy, transparent;
a. [ Hydrocephalus + -oid. ] (Med.) Resembling hydrocephalus. [ 1913 Webster ]
Hydrocephaloid affection (Med.),
n. [ From Natal aloes. ] (Chem.) A bitter crystalline substance constituting the essential principle of Natal aloes. Cf. Aloon. [ 1913 Webster ]
a. [ Neanderthal + -oid. ] (Anthropol.) Like, or pertaining to, the Neanderthal skull, or the type of man it represents. [ Webster 1913 Suppl. ]
a. [ Petal + -oid: cf. F. pétaloïde. ] (Bot.) Petaline. [ 1913 Webster ]
a. (Bot.) Having the whole or part of the perianth petaline. [ 1913 Webster ]
Petaloideous division,
a. [ Sepal + -oid. ] (Bot.) Like a sepal, or a division of a calyx. [ 1913 Webster ]
a. [ NL. Squalus a genus of sharks (fr. L. squalus a kind of sea fish) + -oid. ] (Zool.) Like or pertaining to a shark or sharks. [ 1913 Webster ]
a. (Anat.) Situated under the hyaliod membrane. [ 1913 Webster ]
a. [ Pref. tri- + petaloid. ] (Bot.) Having the form or appearance of three petals; appearing as if furnished with three petals. [ 1913 Webster ]