a tube or elongated cavity (such as a xylem vessel) for conveying water, sap, or air
a vessel for conveying lymph or glandular secretions such as tears or bile
a pipe, tube or canal which carries gas or liquid from one place to another
a layer (as in the atmosphere or the ocean) which occurs under usually abnormal conditions and in which radio or sound waves are confined to a restricted path
an enclosure or channel for electrical cable runs, telephone cables, or other conductors
to enclose in a duct
to channel something (such as a gas) or propagate something (such as radio waves) through a duct or series of ducts
A rectangular hole or slot.
A hidden container that holds a logbook and rubber stamp, found by following clues as a form of recreation.
A delivery point for mail, a box, compartment or slot for this purpose.
A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose.
To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area.
To hunt for letterboxes (containers with logbook and rubber stamp) by following clues.
Transferred to home video formats while preserving the original aspect ratio, having black bars above and below the picture area.