(a.) Producing many, or more than one, at a birth.

aboriginal atomic basal basic central conceptive conceptual corpuscular creative crucial elemental elementary embryonic esemplastic evanescent fattening fecund fecundative fertile fertilizing fetal fructificative fundamental generative genetic germinant germinational germinative germiparous granular ideational ideative imaginative impalpable imperceptible imponderable in embryo in ovo in the bud inappreciable indiscernible infinitesimal ingenious inspired intangible inventive invisible larval life-giving microcosmic microscopic molecular multiparous notional original originative pregnant primal primary primeval primitive primordial pristine procreant procreative productive prolific propagative protogenic radical reproductive richening rudimentary seminal shaping spermatic spermatozoic subatomic teeming tenuous thin ultramicroscopic unseeable visioned