SEGMENTATION n.
he process by which the embryos of all the higher plants and animals are derived from the germ cell. In the simplest case, that of small ova destitute of food yolk, the ovum or egg divides into two similar halves or segments (blastomeres), each of these again divides into two, and so on, thus giving rise to a mass of c…
SEMINAL a.
first principle; holding the first place in a series of developed results or consequents; germinal; radical; primary; original; as, seminal principles of generation; seminal virtue. The idea of God is, beyond all question or comparison, the one great seminal principle. Hare. Seminal leaf (Bot.), a seed leaf, or cotyled…
SERF n.
d that the inferior species [of villeins], existed . . . But by the customs of France and Germany, persons in this abject state seem to have been called serfs, and distinguished from villeins, who were only bound to fixed payments and duties in respect of their lord, though, as it seems, without any legal redress if in…