cornuPronunciation: /ˈkɔːnjuː/Definition of cornu noun (plural cornua /-njʊə/) Anatomy 1a horn-shaped projection of the thyroid cartilage or of certain bones (such as the hyoid and the coccyx). 2either of the two lateral cavities of the womb, into which the fallopian tubes pass. 3each of three elongated parts of the lateral ventricles of the brain. Derivatives cornual adjective Origin: late 17th century: from Latin, 'horn'cornu in other Oxford dictionaries Definition of cornu in the US English dictionary