ناهضة 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.

• نَاهِضَةُ

  نَاهِضَةُ رَجُلٍ ذ (tropical:) A man's people, (L,) or the sons of his father or ancestor, (S, O, K,) who rise for him, (O,) or with him. (K,) or with whom he rises, in a case that grieves him, (L,) or who are angry for …

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