Definition of conus in English:



  • 1The upper front part of the right ventricle of the heart.

    • ‘The heart appears to be the most primitive of all adult vertebrates, with the auricle, ventricle and conus arteriosus arranged in straight line, rather than being doubled over one another.’
    • ‘A conus artery arising from the aorta was found in 50% of 651 subjects.’
    • ‘Since the aorta and the pulmonary artery develop from a common conus arteriosus, irregular and imperfect development of the septum between them may also produce variations.’
  • 2The conical lower extremity of the spinal cord.

    • ‘An MRI (not shown) showed the conus medullaris to be at L1 - L2, and the sacrum to be dysplastic.’
    • ‘The spinal cord tapers caudally to become the conus medullaris.’
    • ‘A spinal ultrasound from the second day of life (not provided) showed the spinal cord conus to be normally positioned at L1.’


Late 19th century: from Latin, literally ‘cone’.