مقر doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 5 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• مَقِرَ Form 1

  1 مَقِرَ ذ , aor. مَقَرَ , (S, Msb,) inf. n. مَقَرٌ, (S, A, Msb, K,) It was, or became, bitter; (S, A, Msb, K;) as also , (ISk, IKtt, A, Msb, K,) inf. n. إِمْقَارٌ: (Msb:) or sour, or acid: (K:) and , said of milk, (AZ, …

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• مَقَرٌّ

  مَقَرٌّ ذ : see قَرَارٌ, in three places.…

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• مُقِرٌّ

  مُقِرٌّ ذ A she-camel whose pregnancy is established: (TA:) or that has condensed and retained the seed of the stallion in her womb, (M, K,) and not ejected it: (M:) or that has conceived, or become pregnant. (IAar.) See…

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• مَقْرٌ

  مَقْرٌ ذ : see مَقِرٌ, in three places.…

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• مَقِرٌ

  مَقِرٌ ذ Bitter; (S, A, Msb, K;) as also (TA) and (S, A, K) and : (Sgh, K:) or sour; acid; as also : (K:) which last also signifies intensely sour or acid; (AZ, Aboo-Málik, S; *) applied to milk: (the same, and K:) or so…

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