The Collaborative International Dictionary of English v.0.48:
Devow \De*vow"\, v. t. [F. d['e]vouer, L. devovere. See
Devote, v. t.]
1. To give up; to devote. [Obs.]
[1913 Webster]
2. [Cf. OF. desvoer. Cf. Disavow.] To disavow; to disclaim.
[Obs.] --G. Fletcher.
[1913 Webster]