The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]