(O`vi*pos"it) v. i. [imp. & p. p. Oviposited; p. pr. & vb. n. Ovipositing.] [See Ovum, and Posit.] To lay or deposit eggs; — said esp. of insects.

(O`vi*pos"it), v. t. To deposit or lay

(O`vi*pos"it*ing O`vi*po*si"tion) n. The depositing of eggs, esp. by insects.

(O`vi*pos"i*tor) n. [L. ovum an egg + positor a placer, fr. ponere to place.] (Zoöl.) The organ with which many insects and some other animals deposit their eggs. Some ichneumon files have a long ovipositor fitted to pierce the eggs or larvæ of other insects, in order to lay their own eggs within the same.

(O"vi*sac) n. [Ovum + sac.] (Anat) (a) A Graafian follicle; any sac containing an ovum or ova. (b) The inner layer of the fibrous wall of a Graafian follicle.

(O"vist) n. (Biol.) Same as Ovulist.

(||O`vo*coc"cus) n.; pl. Ovococci [Ovum + Gr. grain, seed.] (Biol.) A germinal vesicle.

(O"void O*void"al) a. [Ovum + -oid: cf. F. ovoïde.] Resembling an egg in shape; egg-shaped; ovate; as, an ovoidal apple.

(O"void) n. A solid resembling an egg in shape.

(O"vo*lo) n. [It. ovolo, uovolo, fr. L. ovum an egg. Cf. Ovule.] (Arch.) A round, convex molding. See Illust. of Column.

In Roman work it is usually a quarter circle in section; in Greek work it is flatter, and is equivalent to the echinus; that is, it has in section the elastic curve of the shell of the sea urchin. In mediæval architecture it is not distinguishable from the multitude of convex moldings, of all sections, which are used.

(O*vol"o*gy) n. [Ovum + - logy. Cf. F. ovologie.] That branch of natural history which treats of the origin and functions of eggs.

(O`vo*plas"ma) n. [Ovum + plasma.] (Boil.) Yolk; egg yolk. Haeckel.

(O`vo*test"tis) n. [NL. See Ovum, and Testis.] (Zoöl.) An organ which produces both ova and spermatozoids; an hermaphrodite gland.

(O*vo*vi*vip"a*rous) a. [Ovum + viviparous: cf. F. ovovivipare.] (Biol.) Oviparous, but hatching the egg while it is within the body, as some fishes and reptiles.

(O"vu*lar) a. (Biol.) Relating or belonging to an ovule; as, an ovular growth.

(O"vu*la*ry) a. (Biol.) Pertaining to ovules.

(O"vu*late) a. (Biol.) Containing an ovule or ovules.

(O`vu*la"tion) n. (Phisiol.) The formation of ova or eggs in the ovary, and the discharge of the same. In the mammalian female the discharge occurs during menstruation.

(O"vule) n. [Dim. of L. ovum an egg: cf. F. ovule. Cf. Ovolo, Ovulum.] (Biol.) (a) The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen. (b) An ovum.

(O`vu*lif"er*ous) a. [Ovule + -ferous.] (biol.) Producing ovules.

  By PanEris using Melati.

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