mesocardia

noun, plural mes·o·car·di·a [mez-uh–kahr-dee-uh, mes-, mee-zuh-, -suh-] /ˌmɛz əˈkɑr di ə, ˌmɛs-, ˌmi zə-, -sə-/. Embryology.

1. the double layer of splanchnic mesoderm supporting the embryonic heart.

n.

1. An atypical central position of the heart in the chest, as in the embryo.

n. pl. mes•o•car•di•a (-dē-ə)

1. Either of the two layers of the embryonic mesentery supporting the embryonic heart in the pericardial cavity.