a combining form meaning “rib,” used in the formation of compound words:

costo- pref.
Rib: costovertebral.


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  • Costoaxillary vein

    costoaxillary vein cos·to·ax·il·lar·y vein (kŏs’tō-āk’sə-lěr’ē) n. Any of a number of anastomotic veins connecting the intercostal veins of the first to the seventh intercostal spaces with the lateral thoracic or the thoracoepigastric vein.

  • Costocervical artery

    costocervical artery cos·to·cer·vi·cal artery (kŏs’tō-sûr’vĭ-kəl) n. A short artery that arises from the subclavian artery on each side and divides into deep cervical and highest intercostal branches. Also called costocervical trunk.

  • Costochondral

    costochondral cos·to·chon·dral (kŏs’tō-kŏn’drəl) adj. Relating to the ribs and their cartilages.

  • Costochondritis

    costochondritis cos·to·chon·dri·tis (kŏs’tō-kŏn-drī’tĭs) n. The inflammation of the costal cartilages, that is characterized by pain of the anterior chest wall that may radiate.

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