صلاع 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.

• صَلَاعٌ

  صَلَاعٌ ذ , (O, K,) accord. to Ibn-'Abbád, with kesr, (O,) like كِتَابٌ, (K,) in the L [written] with damm, (TA,) The heat of the sun. (O, K.)…

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• صُلَّاعٌ

  صُلَّاعٌ ذ , (S, O, K,) or , (K,) or the latter also, which is app. a contraction of the former, (S, O,) (assumed tropical:) Broad, (S, O, K, TA,) hard, (K, TA,) smooth, (TA,) rock: (S, O, K, TA:) n. un. (of the former, …

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