(1) (botany) Having a petiole or leafstalk attaching the leaf blade to the stem.
(2) (entomology) Having a stalk, e.g. the slender stalk connecting the mesosoma and the gaster of certain insects, such as those in the suborder Apocrita (of the Hymenoptera, such as ants).
In botany, flowering plants may be classified based on the presence of petiole: (1) petiolated plants and (2) sessile plants.
Word origin: from Latin petiolus (little foot), from pēs (foot)