Source : Webster's Revised Unabridged Dictionary (1913)

Loch \Loch\, n. [Gael. & Olr. loch. See {Lake} of water.]
   A lake; a bay or arm of the sea. [Scot.]

Loch \Loch\, n. [F. looch, Ar. la'?g, an electuary, or any
   medicine which may be licked or sucked, fr. la'?g to lick.]
   (Med.)
   A kind of medicine to be taken by licking with the tongue; a
   lambative; a lincture.

Source : WordNet®

loch
     n 1: a long narrow inlet of the sea in Scotland (especially when
          it is nearly landlocked)
     2: Scottish word for a lake