Find the word definition

The Collaborative International Dictionary
Saccus

Saccus \Sac"cus\, n.; pl. Sacci. [L., a sack.] (Biol.) A sac.

Wiktionary
saccus

n. (context botany English) A bladder or wing-like structure found on the pollen grains of many species of conifer. The shape or number of the sacci on a pollen grain can help identify the species it came from.