lightwater noun3 •Water in its standard form.I confess I am not fully aware of all the technicalities, but to what extent then is reprocessed fuel capable of being reused in lightwater reactors, compared to being reused in breeder reactors? — 1978 •Fire-fighting foam.An aqueous film-forming foam consisting of water and a special detergent, lightwater overspreads Class B fires -- those fed by petroleum -- and smothers them instantly. — 1974 •Alternative form of light water.
