Do*dec`a*tem"o*ry (?), n. [Gr. &?;; &?; twelve + &?;, dim. of &?; part: cf. F. dodécatémorie.] (Astron.) A tern applied to the twelve houses, or parts, of the zodiac of the primum mobile, to distinguish them from the twelve signs; also, any one of the twelve signs of the zodiac.