trough(redirected from gingival trough)
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1. a narrow depression either in the land surface, ocean bed, or between two successive waves
2. Meteorol an elongated area of low pressure, esp an extension of a depression
3. Physics the portion of a wave, such as a light wave, in which the amplitude lies below its average value
4. Economics the lowest point or most depressed stage of the trade cycle
A small, straight depression formed just offshore on the bottom of a sea or lake and on the landward side of a longshore bar.
Any narrow, elongate depression in the surface of the earth.
An elongate depression on the sea floor that is wider and shallower than a trench. Also known as submarine trench.
The line connecting the lowest points of a fold.
An elongated area of relatively low atmospheric pressure; the opposite of a ridge.
A channel used to carry electric conductors.