(In compound leaves) that part of the main axis distal to the petiole that bears the leaflets;
(In inflorescences) that part of the main axis distal to the peduncle that bears the flowers.
The axis of a pinna in a bipinnate leaf.
The central elongated axis of a compound leaf or inflorescence (such as in a raceme). Not to be confused with pedicel, peduncle, or petiole.
Back-bone; the axis of a spike.