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Webster 1913 Edition

(ŏb-dūr′)

Verb.

To harden.

[Obs.]

Milton.

Verb.

[L. obduro.]

To harden; to render obstinate in sin. [Little used.]

To render inflexible. [Little used.]

obdure ‎(third-person singular simple present obdures, present participle obduring, simple past and past participle obdured)

(obsolete) To harden.
- Milton
  This saw his hapless foes, but stood obdur'd.