The Collaborative International Dictionary
Scapulet
Scapulet \Scap"u*let\, n. [Dim. of scapula.] (Zo["o]l.) A secondary mouth fold developed at the base of each of the armlike lobes of the manubrium of many rhizostome medus[ae]. See Illustration in Appendix.
Wiktionary
scapulet
n. (context zoology English) A secondary mouth fold developed at the base of each of the arm-like lobes of the manubrium of many rhizostome medusae.