Meaning

noun a narrow depression (as in the earth or between ocean waves or in the ocean bed)

noun a channel along the eaves or on the roof; collects and carries away rainwater

noun a concave shape with an open top

originPIE word *dóru From Middle English trogh, from Old English troh, trog (“a trough, tub, basin, vessel for containing liquids or other materials”), from Proto-West Germanic *trog, from Proto-Germanic *trugą, *trugaz, from Proto-Indo-European *drukós, enlargement of *dóru (“tree”). See also West Frisian trôch, Dutch trog, German Trog, Danish trug, Swedish tråg; also Middle Irish drochta (“wooden…

Etymology from Wiktionary, CC BY-SA 3.0