sterigma noun3 •A slim projecting part of the basidium of some species of fungi that carries the basidiospore. •A woody projection from the tip of the leaf base in certain conifers (Picea and Tsuga).These sterigmata are retained and make the twigs rough for several years after leaf fall. — 2009 •Part of the genitalia of moths. formssterigmas · sterigmata