The Collaborative International Dictionary
Osselet
Osselet \Os"se*let\, n. [F.]
A little bone.
(Zo["o]l.) The internal bone, or shell, of a cuttlefish.
Wiktionary
osselet
n. 1 A little bone. 2 (context zoology English) The internal bone, or shell, of a cuttlefish.
Wikipedia
Osselet
Osselet is arthritis in the fetlock joint of a horse.