D defs.my
Entry 3 senses Webster, 1913

Trough

/(trŏf)/ · IPA /tɹɔθ/
01 n. A long, hollow vessel, generally for holding water or other liquid, especially one formed by excavating a log longitudinally on one side; a…
  1. 1.
    A long, hollow vessel, generally for holding water or other liquid, especially one formed by excavating a log longitudinally on one side; a long tray; also, a wooden channel for conveying water, as to a mill wheel.
  2. 2.
    Any channel, receptacle, or depression, of a long and narrow shape; as, trough between two ridges, etc.
  3. 3.
    The transverse section of a cyclonic area where the barometric pressure, neither rising nor falling, has reached its lowest point.(Meteor.)
Phrases & compounds
Trough gutter — a rectangular or V-shaped gutter, usually hung below the eaves of a house.
Trough of the sea — the depression between two waves.