Word Study
caryopsis
CIDE DICTIONARY
caryopsis, n. [NL., fr. gr. hut, kernel + sight, form.].
A one-celled, dry, indehiscent fruit, with a thin membranous pericarp, adhering closely to the seed, so that fruit and seed are incorporated in one body, forming a single grain, as of wheat, barley, etc. [1913 Webster]
OXFORD DICTIONARY
caryopsis, n. (pl. caryopses) Bot. a dry one-seeded indehiscent fruit, as in wheat and maize.
Etymology
mod.L f. Gk karuon nut + opsis appearance
For further exploring for "caryopsis" in Webster Dictionary Online