n. 1 a long narrow open receptacle for water, animal feed, etc. 2 a channel for conveying a liquid. 3 an elongated region of low barometric pressure. 4 a hollow between two wave crests. 5 the time of lowest economic performance etc. 6 a region around the minimum on a curve of variation of a quantity. 7 a low point or depression.
[ OE trog f. Gmc ]