trough /trof/

1. A long narrow vessel for watering or feeding animals
2. A vessel for kneading, brewing, washing, tanning or various domestic and industrial purposes
3. A vessel for liquid over which gases are collected (pneumatic trough)
4. A channel, gutter or conduit
5. A long narrow depression
6. A hollow between wave crests
7. A low point (figurative)
8. An elongated area of low atmospheric pressure, usu extending from a depression and marking a change of air-mass (meteorology)

trough fault noun (geology)

A pair of parallel faults with downthrow between them

trough shell noun

A lamellibranch with a somewhat triangular shell thought to resemble a kneading-trough (genus Mactra)

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