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Webster 1913 Edition

Verb.

[1st pref.

un-

seel

To open, as the eyes of a hawk that have been seeled; hence, to give light to; to enlighten.

[Obs.]

B. Jonson.

unseel ‎(third-person singular simple present unseels, present participle unseeling, simple past and past participle unseeled)

(obsolete) To open, as the eyes of a hawk that have been seeled.
(obsolete, by extension) To give light to; to enlighten.
(Can we find and add a quotation of Ben Jonson to this entry?)