Meaning of cacao nut in English:

cacao nut

noun

  • The seed of the cacao tree; (occasionally also) the pod containing this.

    The term is strictly a misnomer: the cacao seed lacks a true shell, the outer layer or seed coat becoming hard only when the seed is fermented and dried, and the leathery pod itself is not technically a nut.

Origin

Early 17th century; earliest use found in Samuel Purchas.