WordReference Random House Unabridged Dictionary of American English © 2026
gra•min•e•ous  (grə min′ē əs),USA pronunciation adj. 
  1. Plant Biologygrasslike.
  2. Plant Biologybelonging to the Gramineae family of plants. Cf. grass family.
  • Latin grāmineus pertaining to grass, equivalent. to grāmin- (stem of grāmen) grass + -eus -eous
  • 1650–60
gra•min′e•ous•ness, n. 

Collins Concise English Dictionary © HarperCollins Publishers::
gramineous /ɡrəˈmɪnɪəs/, graminaceous /ˌɡræmɪˈneɪʃəs/ adj
  1. resembling a grass; grasslike
Etymology: 17th Century: from Latin grāmineus of grass, grassy, from grāmen grass
'graminaceous' also found in these entries (note: many are not synonyms or translations):
gramineous

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