trough

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Related to focal trough: panoramic radiography

trough

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

trough

[trȯf]
(geology)
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.
(meteorology)
An elongated area of relatively low atmospheric pressure; the opposite of a ridge.

trough

A channel used to carry electric conductors.
References in periodicals archive ?
The anterior portion of the mandible is drawn out of the focal trough in this position, creating distortion in the mandibular central incisors and bony detail of the chin.
When the head is turned to either side, there is a distinct asymmetry between the left and right anatomy as 1 entire side may be placed partially or entirely out of the focal trough.