Strong's #5799: `aza'zel (pronounced az-aw-zale')
 from 5795 and 235; goat of departure; the scapegoat:--scapegoat.
Brown-Driver-Briggs Hebrew Lexicon:
 
  ‛ăzâ'zêl 
 
 1) entire removal, scapegoat
 
 1a) refers to the goat used for sacrifice for the sins of the people
 1b) meaning dubious
 
  Part of Speech: noun masculine
Relation: from H5795 and H235
Usage:
This word is used 4 times:
Leviticus 16:8: "for the LORD, and the other lot  for the scapegoat."
Leviticus 16:10: "which the lot fell  to be the scapegoat, shall be presented alive before the LORD,"
Leviticus 16:10: "to make an atonement with him, and to let him go  for a scapegoat into the wilderness."
Leviticus 16:26: "And he that let go the goat  for the scapegoat shall wash his clothes, and bathe"