(Anat.), epithelium in which the cells are prismatic in form, and set upright on the surface they cover.Columnar structure(Geol.), a structure consisting of more or less regular columns, usually six-sided, but sometimes with eight or more sides. The columns are often fractured transversely, with a cup joint, showing a concave surface above. This structure is characteristic of certain igneous rocks, as basalt, and is due to contraction in cooling.

(Col`um*nar"i*ty) n. The state or quality of being columnar.

(Co*lum"na*ted) a. Having columns; as, columnated temples.

(Col"umned) a. Having columns.

Troas and Ilion's columned citadel.

(Co*lum`ni*a"tion) n. The employment or arrangement of columns in a structure. Gwilt.

(Co*lure") n.; pl. Colures [F. colure, L. coluri, pl., fr. Gr. ko`loyros dock-tailed, a"i ko`loyroi (sc. grammai` lines) the colures; fr. ko`los docked, stunted + o'yra` tail. So named because a part is always beneath the horizon.] (Astron. & Geog.) One of two great circles intersecting at right angles in the poles of the equator. One of them passes through the equinoctial points, and hence is denominated the equinoctial colure; the other intersects the equator at the distance of 90° from the former, and is called the solstitial colure.

Thrice the equinoctial line
He circled; four times crossed the car of night
From pole to pole, traversing each colure.

(Co"ly) n.; pl. Colies [NL. colius, prob. fr. Gr. a kind of woodpecker.] Any bird of the genus Colius and allied genera. They inhabit Africa.

(Col"za) n. [F., fr. D. koolzaad, prop., cabbage seed; kool (akin to E. cole) + zaad, akin to E. seed.] (Bot.) A variety of cabbage (Brassica oleracea), cultivated for its seeds, which yield an oil valued for illuminating and lubricating purposes; summer rape.

(Com-). A prefix from the Latin preposition cum, signifying with, together, in conjunction, very, etc. It is used in the form com- before b, m, p, and sometimes f, and by assimilation becomes col- before l, cor- before r, and con- before any consonant except b, h, l, m, p, r, and w. Before a vowel com- becomes co-; also before h, w, and sometimes before other consonants.

(||Co"ma) n. [NL., fr. Gr. kw^ma lethargy, fr. koima^n to put to sleep. See Cemetery.] A state of profound insensibility from which it is difficult or impossible to rouse a person. See Carus.

(||Co"ma), n. [L., hair, fr. Gr. ko`mh.]

1. (Astron.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet.

2. (Bot.) A tuft or bunch, — as the assemblage of branches forming the head of a tree; or a cluster of bracts when empty and terminating the inflorescence of a plant; or a tuft of long hairs on certain seeds.

Coma Berenices[L.] (Astron.), a small constellation north of Virgo; — called also Berenice's Hair.

(Co*man"ches) n. pl.; sing. Comanche (Ethnol.) A warlike, savage, and nomadic tribe of the Shoshone family of Indians, inhabiting Mexico and the adjacent parts of the United States; — called also Paducahs. They are noted for plundering and cruelty.

(Co"mart`) n. A covenant. [Obs.] Shak.

Columnar epithelium

  By PanEris using Melati.

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