The Collaborative International Dictionary of English v.0.48:

seme \seme\ (s[=e]m), n. [Gr. sh^ma a sign.]
   1. (Linguistics) A linguistic sign.
      [PJC]

   2. (Linguistics) A basic component of meaning of a morpheme,
      especially one which cannot be decomposed into more basic
      components; a primitive concept.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Sem'e \Se*m['e]"\, a. [F. sem['e], fr. semer to sow.] (Her.)
   Sprinkled or sown; -- said of field, or a charge, when
   strewed or covered with small charges.
   [1913 Webster] Semeiography