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From The Collaborative International Dictionary of English v.0.48:
Semen \Se"men\ (s[=e]"m[e^]n), n.; pl. Semina (s[e^]m"[i^]*n[.a]). [L., from the root of serere, satum, to sow. See Sow to scatter seed.] 1. (Bot.) The seed of plants. [1913 Webster] 2. (Physiol.) The seed or fecundating fluid of male animals; sperm. It is a white or whitish viscid fluid secreted by the testes, characterized by the presence of spermatozoids to which it owes its generative power. [1913 Webster] Semen contra, or Semen cinae or Semen cynae, a strong aromatic, bitter drug, imported from Aleppo and Barbary, said to consist of the leaves, peduncles, and unexpanded flowers of various species of Artemisia; wormseed. [1913 Webster]