cypsela
Concise Oxford English Dictionary © 2008 Oxford University Press:
cypsela /ˈsɪpsɪlə/
▶noun (pl. cypselae /-liː/) Botany a dry single-seeded fruit formed from a double ovary of which only one develops into a seed, as in the daisy family.
– origin C19: mod. L., from Gk kupselē ‘hollow vessel’.
'cypsela' also found in these Oxford entries:

