(1):

(n.) The peduncle or stem by which various marine animals are attached, as certain brachiopods and goose barnacles.

(2):

(n.) The stem which supports which supports the eye in decapod Crustacea; eyestalk.

(3):

(n.) The stalk of a leaf or of flower; a petiole, pedicel, or reduncle.

(4):

(n.) The lower part of a millstone spindle. It rests in a step.