trough, s.1Dabhach f, umar m, trach m. Husb: Drinking trough, trach m uisce. Feeding trough, trach m beathaithe. Ph: Mercury trough, umar m bícheirb. Pneumatic trough, gásumar m. S.a. HORSE-TROUGH, KNEADING-TROUGH. 2Gáitéar m, lintéar m. 3Geol: Umar m. 4Trough of the sea, log m na toinne. Ph: Trough of a wave, log m toinne. 5Trough of low pressure, log ísealbhrúite.