From Longman Dictionary of Contemporary Englishpropagatorprop‧a‧gat‧or /ˈprɒpəɡeɪtə $ ˈprɑːpəɡeɪtər/ noun [countable] 1 someone who spreads ideas, beliefs etc2 DLGa covered box of soil in which young plants or seeds are placed so that they can grow
Examples from the Corpus
propagator• A propagator can also be used to safeguard tender plants from frost.• Our hardwood propagator would do even better.• When there's a possibility of frost I cover it with a polythene bin bag - an instant propagator.• His Minister of Education, Uvarov - the propagator of the doctrine - understood the tsar's position only too well.• Unheated propagators must be placed somewhere warm.• Place the sown containers in a warm propagator to germinate. 