Source : Webster's Revised Unabridged Dictionary (1913)

Limulus \Lim"u*lus\ (l[i^]m"[-u]*l[u^]s), n.; pl. {Limuli}
   (-l[imac]). [L., dim. of limus sidelong, askance.] (Zo["o]l.)
   The only existing genus of Merostomata. It includes only a
   few species from the East Indies, and one ({Limulus
   polyphemus}) from the Atlantic coast of North America. Called
   also {Molucca crab}, {king crab}, {horseshoe crab}, and
   {horsefoot}.

Source : WordNet®

Limulus
     n : type genus of the family Limulidae [syn: {genus Limulus}]