From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
64 Moby Thesaurus words for "drainage": air-drying, anhydration, aspiration, bleeding, bloodletting, broaching, cleaning out, clearance, clearing, cupping, defecation, defluxion, dehumidification, dehydration, depletion, desiccation, discharge, discharging cargo, drafting, drain, draining, drawing, drying, drying up, effluence, efflux, effluxion, effusion, egress, elimination, emptying, evacuation, evaporation, excretion, exhalation, exhaust, exhausting, exhaustion, flowoff, gush, insolation, milking, mummification, off-loading, outfall, outflow, outflowing, outpour, outpouring, phlebotomy, pipetting, pumping, removal, runoff, siphoning, sucking, suction, tapping, unloading, venesection, venting, voidance, voiding, withering
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