Source : Webster's Revised Unabridged Dictionary (1913)

Chelicera \Che*lic"e*ra\ (k[-e]*l[i^]s"[-e]*r[.a]), n.; pl.
   {Chelicer[ae]} (-r[=e]). [NL., fr. Gr. chhlh` claw + ke`ras
   horn.] (Zo["o]l.)
   One of the anterior pair of mouth organs, terminated by a
   pincherlike claw, in scorpions and allied Arachnida. They are
   homologous with the falcers of spiders, and probably with the
   mandibles of insects.

Source : WordNet®

chelicera
     n : either of the first pair of fang-like appendages near the
         mouth of an arachnid; often modified for grasping and
         piercing
     [also: {chelicerae} (pl)]