noun, plural: petioles
(Botany) Flowering plants may be classified based on their petioles:
(Entomology) The petioles in ants are used for their identification. Some ants have single segment while others have two segments. The two segments are referred to by others as (1) the petiole and (2) the post-petiole). The structure connecting the mesosoma and the gaster of ants serves as the "waist" of the ant.
Word origin: from Latin petiolus (little foot), from pēs (foot)