عمانية doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• عُمَانِيَّةٌ

  عُمَانِيَّةٌ ذ A sort of palm-tree in El-Basrah, that ceases not to have upon it, during the year, (K, TA,) i. e. all the year, (TA,) new spadixes, and racemes putting forth fruit, and others bearing ripe dates. (K, TA.)…

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