مَعْقِمٌ

A joint of a horse; (S, K;) such as [that of] the pastern, next the hoof, and the knee, and the hock: (S:) plural مَعَاقِمُ: (S, K:) the plural 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.)

Also A joint, or knot, in straw. (S, TA.)