1.  mamma(n = noun.person) ma, mama, mammy, mom, momma, mommy, mum, mummy - informal terms for a mother;
is a kind of female parent, mother

2.  mamma(n = noun.body) mammary gland - milk-secreting organ of female mammals;
is a kind of duct gland, exocrine, exocrine gland
is a part of female mammal
has parts: mamilla, mammilla, nipple, pap, teat, tit
has particulars: dug, bag, udder, boob, bosom, breast, knocker, tit, titty
Derived form adjective mammary₁

   Mother; -- word of tenderness and familiarity. [1913 Webster]
"Tell tales papa and mamma." [1913 Webster]

   A glandular organ for secreting milk, characteristic of all mammals, but usually rudimentary in the male; a mammary gland; a breast; udder; bag. [1913 Webster]

mamma, n. (also momma) colloq. (esp. as a child's term) mother.

mamma, n. (pl. mammae)
1 a milk-secreting organ of female mammals.
2 a corresponding non-secretory structure in male mammals.

Derivative:
mammiform adj.

Etymology:
OE f. L

N  paternity, parentage, consanguinity, parent, father, sire, dad, papa, paterfamilias, abba, genitor, progenitor, procreator, ancestor, grandsire, grandfather, great- grandfather, fathership, fatherhood, mabap, house, stem, trunk, tree, stock, stirps, pedigree, lineage, line, family, tribe, sept, race, clan, genealogy, descent, extraction, birth, ancestry, forefathers, forbears, patriarchs, motherhood, maternity, mother, dam, mamma, materfamilias, grandmother, paternal, parental, maternal, family, ancestral, linear, patriarchal, avi numerantur avorum, happy he with such a mother, hombre bueno no le busquen abolengo, philosophia stemma non inspicit.