Ocypodian
Pronunciation : O`cy*po"di*an
Part of Speech : n.
Etymology : [Gr. 'wky`s swift + poy`s, podo`s, foot.] (Zo?l.)
Definition : Defn: One of a tribe of crabs which live in holes in the sand along the seashore, and run very rapidly, -- whence the name.
Source : Webster's Unabridged Dictionary, 1913