Source : Webster's Revised Unabridged Dictionary (1913)

Acerous \Ac"er*ous\, a.
   Same as {Acerose}.

Acerous \Ac"er*ous\, a. [Gr. [alpha] priv. + ke`ras a horn.]
   (Zo["o]l.)
   (a) Destitute of tentacles, as certain mollusks.
   (b) Without antenn[ae], as some insects.