غمس 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.

• غَمَسَهُ Form 1

  1 غَمَسَهُ ذ , (S, A, Msb, K,) aor. غَمِسَ , (Msb, K,) inf. n. غَمْسٌ, (Msb, TA,) He immersed, immerged, dipped, plunged, or sunk, him or it, (JK, TA,) syn. مَقَلَهُ, (S, A, K,) in water, (JK, S, A, Msb, K,) or other flu…

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• غَمَسٌ

  غَمَسٌ ذ , [like نَفَضٌ in the sense of مَنْفُوضٌ, &c., or perhaps a mistranscription for غَمْسٌ, like غَرْسٌ in the sense of مَغْرُوسٌ, and many other instances,] Immersed, immerged, dipped, plunged, or sunk. (TA.)…

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