• (a.) Having the stamens come to maturity before the pistil; -- opposed to proterogynous.
Pro`ter·an'drous adjective [ Greek ... earlier (fr. ... before) + ..., ..., man, male.] (Botany) Having the stamens come to maturity before the pistil; -- opposed to proterogynous . 
Anthers maturing before pistils.
proterandrous, proterandry 1. In botany, having the stamens or male organs mature before the pistil or female organ. 2. In zoology, a hermaphrodite animal; or a colony of zooids, having the male organs, or individuals, sexually mature before the female organs.