Definition: Arachis - A genus of flowering plants in the family Fabaceae, native to Asia and parts of Africa. Definition: Arachis is a group of flowering plants that include cacti (including various species like the cactus), succulents, and many other types of living things. These plants are often used as ornamental or medicinal plants due to their ability to store water in their leaves. The genus Arachis includes over 100 species.