car·dio·car·pon \ˌ ̷ ̷ ̷ ̷ ̷ ̷ˈkärˌpän\noun alsocar·dio·car·pum\-_pəm\ (-s) Etymology: New Latin, from cardi- + -carpon, -carpum (from Greek karpos fruit) — more at harvest : any of certain nutlike fruits or seeds of plants of the fossil genus Cordaites