the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid > types of ovum (7)
An imperfect or unproductive egg, esp. one with a soft shell, such as may be laid by hens and other domestic birds.
an unfertilized egg; cf. wind-egg, n. a.
The eggs of the silkworm moth. Cf. seed, n. 6a.
An ovum that can develop without fertilization, as produced by some aphids and gall midges.