any tube, canal, pipe, or conduit by which a fluid, air, or other substance is conducted or conveyed.

Anatomy, Zoology . a tube, canal, or vessel conveying a body fluid, esp. a glandular secretion or excretion.

Botany . a cavity or vessel formed by elongated cells or by many cells.

Electricity . a single enclosed runway for conductors or cables.

Printing . (in a press) the reservoir for ink.

to convey or channel by means of a duct or ducts

Heat from the oven is ducted to the outside.

noun

aqueduct , canal , conduit , course , funnel , passage , tube , vessel , watercourse , channel , chute , meatus , outlet , pipe , vas