dropseed Syllabification: (drop·seed)Pronunciation: /ˈdräpˌsēd/Definition of dropseed noun a grass that readily drops its seeds. Genus Sporobolus, family Gramineae: several species, including the widespread North American sand dropseed (S. cryptandrus), which has a high yield of edible grain dropseed in other Oxford dictionaries Definition of dropseed in the British & World English dictionary