paxilla
/pakˈsɪlə/Zoology
noun
An ossicle in the endoderm of the aboral surface of some starfishes, having a column-like part projecting above the body surface which has a flattened top covered with small hinged spines which may be lowered to create a cavity next to the aboral surface.
Origin
Late 19th century; earliest use found in George Rolleston (1829–1881), physician and physiologist. From scientific Latin paxilla from classical Latin paxillus small stake, peg.