endosperm

English Thesaurus

1. nutritive tissue surrounding the embryo within seeds of flowering plants (noun.plant)

hypernym	:	reproductive structure,
definition	:	the parts of a plant involved in its reproduction (noun.plant)

part meronym	:	seed,
definition	:	a mature fertilized plant ovule consisting of an embryo and its food source and having a protective coat or testa (noun.plant)