The Collaborative International Dictionary of English v.0.48:

Mara \Ma"ra\, n. [Skr. m[=a]ra.] (Hind. Myth.)
   The principal or ruling evil spirit. --E. Arnold.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mara \Ma"ra\, n. [Icel. mara nightmare, an ogress. See
   Nightmare.] (Norse Myth.)
   A female demon who torments people in sleep by crouching on
   their chests or stomachs, or by causing terrifying visions.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mara \Ma"ra\, n. (Zool.)
   The Patagonian cavy, a hare-like rodent (Dolichotis
   patagonum or Dolichotis Patagonicus) of the pampas of
   Argentina.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Mara
    n 1: Hindu god of death; opposite of Kama
    2: hare-like rodent of the pampas of Argentina [syn: mara,
       Dolichotis patagonum]

Easton's 1897 Bible Dictionary:

Mara
   bitter; sad, a symbolical name which Naomi gave to herself
   because of her misfortunes (Ruth 1:20).


Hitchcock's Bible Names Dictionary (late 1800's):

Mara, Marah, bitter; bitterness