Webster's English Dictionary

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waterspout

wa.ter.spout \'wo.t-*r-.spau.t, 'wa:t-\ n 1: a pipe, duct, or orifice from 
   which water is spouted or through which it  is carried 2: a funnel-shaped 
   or tubular column of rotating cloud-filled wind usu. ext ending from the 
   underside of a cumulus or cumulonimbus cloud down to a cloud of spray torn 
   up by the whirling winds from the surface of an ocean or lake