mammaryPronunciation: /ˈmaməri/Translate mammary | into Italian Definition of mammary adjective denoting or relating to the human female breasts or the milk-secreting organs of other mammals: mammary tumour viruses noun (plural mammaries) informal a breast: Page Three has become synonymous with mammariesOrigin: late 17th century: from mamma2 + -ary1mammary in other Oxford dictionaries Definition of mammary in the US English dictionary