[ 'kəʊnəs ]
■ noun ( plural coni -nʌɪ ) Anatomy
1》 (also ~ arteriosus α:ˌtɪərɪ'əʊsəs ) the upper front part of the right ventricle of the heart.
2》 (also ~ medullaris ˌmɛdə'lα:rɪs ) the conical lower extremity of the spinal cord.
Origin
C19: from L., lit. 'cone'.