Lima beans are the seeds of the lima bean plant, Phaseolus lunatus. They are not technically a fruit, but a legume, which means they are part of a pod that contains the seeds.

Here's a breakdown of the parts of a lima bean:

* Seed coat: The outer layer of the bean, which protects the seed.

* Cotyledons: The two fleshy halves of the bean that contain food reserves for the developing plant embryo.

* Hilum: The small scar on the seed where it was attached to the pod.

* Micropyle: A small opening in the seed coat that allows water and oxygen to enter.

* Embryo: The tiny plant inside the bean, which will eventually grow into a new lima bean plant.

While we typically eat the cotyledons, the seed coat can also be eaten, although it may have a tougher texture.

Hope this helps!