عقم

مَعْقِمٌ ذ A joint of a horse; (S, K;) such as [ that of ] the pastern, next the hoof, and the knee, and the hock: (S:) pl. مَعَاقِمُ: (S, K:) the pl. signifies certain vertebræ between [ the one called ] the فَرِيدَة [q. v.] and the عَجْب [i. e. the root, or base, of the tail ], in the hinder part of the backbone, (K, TA,) of the horse. (TA.) One says of a horse, هُوَ شَدِيدُ المَعَاقِمِ, meaning He is strong in respect of the vertebræ above mentioned: and likewise, in the joints of the pasterns. (TA.) ― -b2- Also A joint, or knot, in straw. (S, TA.)