استعلب 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.

• استعلب Form 10

  10 استعلب ذ , said of flesh, or flesh-meat, It was, or became, thick, or coarse; not soft, or tender: (O:) or it was, or became, hard, or firm, and thick, or coarse; and likewise said of skin. (L.) [And عَلِبَ and عَلَبَ…

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