Source : Webster's Revised Unabridged Dictionary (1913)

Leucosoid \Leu"co*soid\ (-soid), a. [NL. Leucosia, the typical
   genus (fr. Gr. leyko`s white) + -oid.] (Zo["o]l.)
   Like or pertaining to the {Leucosoidea}, a tribe of marine
   crabs including the box crab or {Calappa}.