caryopsis
Concise Oxford English Dictionary © 2008 Oxford University Press:
caryopsis /ˌkarɪˈɒpsɪs/
▶noun (pl. caryopses /-siːz/) Botany a dry one-seeded fruit in which the ovary wall is united with the seed coat, typical of grasses and cereals.
– origin C19: from mod. L., from Gk karuon ‘nut’ + opsis ‘appearance’.
'caryopsis' also found in these Oxford entries:

