لامس 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.

• لَامِسٌ

  لَامِسٌ ذ act. part. n. of 1. (Msb, &c.) One says, of a woman who commits adultery, or fornication, or acts viciously, فَلَانَةُ لَا تَرُدُّ يَدَ لَامِسٍ, (A, TA,) or لَا تَمْنَعُ يَدَ لَامِسٍ, (K,) but the latter is at …

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