Defn: 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.
OVISAC O"vi*sac, n. Etym: [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.
OVISM
O"vism, n. [Ovum + -ism.] (Zoöl.)
Defn: The old theory that the egg contains the whole embryo of the future organism and the germs of all subsequent offsprings and is merely awakened to activity by the spermatozoön; — opposed to spermism or animalculism.
OVIST
O"vist, n. (Biol.)
Defn: Same as Ovulist.
OVOCOCCUS
O`vo*coc"cus, n.; pl. Ovococci. Etym: [Ovum + Gr. (Biol.)
Defn: A germinal vesicle.
OVOID; OVOIDAL
O"void, O*void"al, a. Etym: [Ovum + -oid: cf. F. ovoïde.]
Defn: Resembling an egg in shape; egg-shaped; ovate; as, an ovoidal apple.