Definition of gemmae:
(n) :
(biology) An asexual reproductive structure, as found in animals such as hydra (genus Hydra) and plants such as liverworts (division Marchantiophyta), consisting of a cluster of cells from which new individuals can develop; a bud.
(n) :
A female given name from Italian.
(n) :
(astronomy) A bright binary star in the constellation Corona Borealis; Alpha (α) Coronae Borealis.