The Collaborative International Dictionary of English v.0.48:
Gloat \Gloat\, v. i. [imp. & p. p. Gloated; p. pr. & vb. n.
Gloating.] [Akin to Icel. glotta to smile scornfully, G.
glotzen to gloat.]
To look steadfastly; to gaze earnestly; to gaze with
passionate desire, lust, or avarice.
2. To gaze with malignant satisfaction; to exult maliciously,
sometimes also triumphantly, in another's loss or
discomfort; -- usually in a bad sense.
In vengeance gloating on another's pain. --Byron.