applicator

n. device used to apply substances; one who applies

A microwave oven, or microwave, is a kitchen appliance employing microwave radiation primarily to cook or heat food. Microwave ovens have revolutionized food preparation since their use became widespread in the 1970s.
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Ap·pli·ca·tor n. An instrument for applying something, such as a medication. applicator, n a device for applying medication; usually a slender rod [more]Applicator - Community and Resources

Noun
1. a device for applying a substance
(synonym) applier
(hypernym) device
(hyponym) flux applicator

noun
instrument for applying a substance