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. [ 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 ]
n.
Amyloid degeneration (Med.),
n. (Med.) A disorder characterized by deposit of extracellular amyloid{ 2 } in organs or tissues in an amount that interferes with normal function of the affected organ; it is often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma. Called also
n. [ F. annelé ringed + -oid. ] (Zool.) An animal resembling an annelid. [ 1913 Webster ]
a. (Zool.) Of or pertaining to the Annuloida. [ 1913 Webster ]
‖n. pl. [ NL., fr. L. annulus ring + -oid. ] (Zool.) A division of the Articulata, including the annelids and allied groups; sometimes made to include also the helminths and echinoderms.
a. [ Astragalus + -oid. ] (Anat.) Resembling the astragalus in form. [ 1913 Webster ]
‖n. pl. [ NL., fr. Gr.
n. [ Beryl + -oid. ] (Crystallog.) A solid consisting of a double twelve-sided pyramid; -- so called because the planes of this form occur on crystals of beryl. [ 1913 Webster ]
adj.
n. [ Cellulose + -oid. ] A substance composed essentially of gun cotton and camphor, and when pure resembling ivory in texture and color, but variously colored to imitate coral, tortoise shell, amber, malachite, etc. It is used in the manufacture of jewelry and many small articles, as combs, brushes, collars, and cuffs; -- originally called
a. [ Cephalo- + -oid. ] Shaped like the head. Craing. [ 1913 Webster ]
a. [ Gr.
n.
Styptic colloid (Med.),
a. Pertaining to, or of the nature of, colloids. [ 1913 Webster ]
n. The state or quality of being colloidal. [ 1913 Webster ]
a. [ Condyle + -oid: cf. F. condyloïde. ] (Anat.) Shaped like or pertaining to a condyle. [ 1913 Webster ]
a. [ L. corallum coral + -oid: cf. F. coralloïde. ] Having the form of coral; branching like coral. [ 1913 Webster ]
a. resembling coral; coralloid. Sir T. browne. [ 1913 Webster ]
a. [ Gr.
n.
a. [ L.cuculus a cuckoo + -oid. ] (Zool.) Like or belonging to the cuckoos (
a. [ NL. cyathophyllum, fr. Gr.
n. (Paleon.) A fossil coral of the family
n. [ Cyclo- + -oid: cf. F. cycloïde. ] (Geom.) A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane. [ 1913 Webster ]
☞ The common cycloid is the curve described when the generating point (p) is on the circumference of the generating circle; the curtate cycloid, when that point lies without the circumference; the prolate or inflected cycloid, when the generating point (p) lies within that circumference. [ 1913 Webster ]
a. (Zool.) Of or pertaining to the Cycloidei. [ 1913 Webster ]
Cycloid scale (Zool.),
n. (Zool.) One of the Cycloidei. [ 1913 Webster ]
a. Pertaining to, or resembling, a cycloid;
Cycloidal engine.
‖n. pl. [ NL., fr. Gr.
a. & n. (Zool.) Same as 2d and 3d Cycloid. [ 1913 Webster ]
n. [ Gr.
A: I'm not interested in diploids.
B: Oh, how I wish your parents had felt the same way!
a. [ Gr.
n. An encephaloid cancer. [ 1913 Webster ]
a. [ Gr.
Encephaloid cancer (Med.),
a. [ Endothelium + -oid. ] (Anat.) Like endothelium. [ 1913 Webster ]
n. [ Epicycle + -oid: cf. F. épicycloïde. ] (Geom.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle. [ 1913 Webster ]
☞ Any point rigidly connected with the rolling circle, but not in its circumference, traces a curve called an epitrochoid. The curve traced by a point in the circumference of the rolling circle when it rolls on the concave side of a fixed circle is called a hypocycloid; the curve traced by a point rigidly connected with the rolling circle in this case, but not its circumference, is called a hypotrochoid. All the curves mentioned above belong to the class class called
a. Pertaining to the epicycloid, or having its properties. [ 1913 Webster ]
Epicycloidal wheel,
a. (Anat.) Epithelioid. [ 1913 Webster ]
n. [ L., fr. Gr.
a. [ Gr.
a. [ NL., fr. Gr.
a. [ Gr. &unr_; glassy, transparent;
a. [ Hydrencephalus + -oid. ] (Med.) Same as Hydrocephaloid. [ 1913 Webster ]
a. [ Hydrocephalus + -oid. ] (Med.) Resembling hydrocephalus. [ 1913 Webster ]
Hydrocephaloid affection (Med.),