primary sex characteristic

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Related to primary sex characteristic: secondary sex characteristic
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Noun1.primary sex characteristic - the genetically determined sex characteristics bound up with reproduction (genitals and organs of reproduction)
sex character, sex characteristic, sexual characteristic - those characteristics (both anatomical and psychological) that are strongly associated with one sex relative to the other
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Sex refers to the physical characteristics that are associated with being male or female, including primary sex characteristics such as genitals and secondary sex characteristics such as breasts.