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Definition of solid noun from the Oxford Advanced Learner's Dictionary

picture of a prism

solid

noun

solid pronunciation English

ˈsɒlɪd

solid pronunciation American

ˈsɑːlɪd

not liquid/gas

1 a substance or an object that is solid, not a liquid or a gasliquids and solidsThe baby is not yet on solids (= eating solid food).

shape

2 (geometry) a shape which has length, width and height, such as a cube