Pepo: Unilocular berry with hard exocarp, characteristic of the gourd family (Cucurbitaceae).*
The pumpkin is a classic example of a pepo. In fact, the species most often used to make jack-o-lanterns is Cucurbita pepo. Happy Halloween!
*Pell, S.K., Angell, B. (2016). A botanist’s vocabulary: 1300 terms explained and illustrated. Portland: Timber Press.