استعممته 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.

• اِسْتَعْمَمْتُهُ Form 10

  10 اِسْتَعْمَمْتُهُ ذ , (K,) or اِسْتَعْمَمْتُهُ عَمًّا, (S,) I took him, or adopted him, as a paternal uncle: (S, K:) and عَمًّا He took, or adopted, a paternal uncle. (TA in art. خول.) -A2- See also 8, first sentence.…

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