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dome noun

Click to hear the UK pronunciation of this wordClick to hear the US pronunciation of this word/dəʊm//doʊm/ n [C]

Definition

a rounded roof on a building or a room, or a building with such a roof
a shape like one-half of a ball
Gerald had a long grey beard and a shiny bald dome (= head).

(Definition of dome noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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