Source : Webster's Revised Unabridged Dictionary (1913)

Gloam \Gloam\, v. i. [See {Gloom}, {Glum}.]
   1. To begin to grow dark; to grow dusky.

   2. To be sullen or morose. [Obs.]

Gloam \Gloam\, n.
   The twilight; gloaming. [R.] --Keats.