عهنة doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• عُهْنَةٌ

  عُهْنَةٌ ذ [as a quasi-inf. n.] The bending of a branch, rod, or twig: or its breaking without becoming separated; so that when one looks at it, he finds it to be whole; and when he shakes it, it bends. (TA. [See 1, last…

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• عِهْنَةٌ

  عِهْنَةٌ ذ : see عِهْنٌ. -A2- Also A certain tree (K, TA) in the desert, (TA,) having a red [flower such as is termed] وَرْدَة; (K, TA;) mentioned by Az as having been seen by him: said by AHn to be a بَقْلَة [i. e. herb…

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