Source : Webster's Revised Unabridged Dictionary (1913)

Glower \Glow"er\, v. i. [imp. & p. p. {Glowered}; p. pr. & vb.
   n. {Glowering}.] [Cf. {Gloar}.]
   to look intently; to stare angrily or with a scowl.
   --Thackeray.