Source : Webster's Revised Unabridged Dictionary (1913)

Scrag \Scrag\ (skr[a^]g), n. [Cf. dial. Sw. skraka a great dry
   tree, a long, lean man, Gael. sgreagach dry, shriveled,
   rocky. See {Shrink}, and cf. {Scrog}, {Shrag}, n.]
   1. Something thin, lean, or rough; a bony piece; especially,
      a bony neckpiece of meat; hence, humorously or in
      contempt, the neck.

            Lady MacScrew, who . . . serves up a scrag of mutton
            on silver.                            --Thackeray.

   2. A rawboned person. [Low] --Halliwell.

   3. A ragged, stunted tree or branch.

   {Scrag whale} (Zo["o]l.), a North Atlantic whalebone whale
      ({Agaphelus gibbosus}). By some it is considered the young
      of the right whale.