غيم doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• غَامَتِ Form 1

  1 غَامَتِ السَّمَآءُ ذ , (S, Msb, K,) aor. تَغِيمُ, inf. n. غَيْمٌ; (Msb;) and ; and , (S, Msb, K,) inf. n. تَغْيِيمٌ; (K;) and (S, Msb, K) and أَغْيَمَت; (S, K;) all signify the same; (S;) The sky was, or became, cloud…

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• غَيَّمَ Form 2

  2 غَيَّمَ see 1. -b2- [Hence,] غيّم اللَّيْلُ, (K,) inf. n. تَغْيِيمٌ, (TA,) (tropical:) The night became like the غَيْم [or clouds]; (K;) became dark, and came like the clouds. (TA.) -b3- And غيّم الطَّائِرُ (assumed tr…

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• غَيْمٌ

  غَيْمٌ ذ , originally an inf. n., from غَامَتِ السَّمَآءُ [q. v.], (Msb,) Clouds; (S, Msb, K, TA;) n. un. with ة: (Msb:) or [an expanse of clouds covering the sky,] when one sees not a sun (Kr, TA) by reason of much cov…

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