noun
: either of a pair of longitudinal ectodermal thickenings in the mammalian embryo that extend from the base of the anterior to the posterior limb buds and are the source of the mammary glands — called also milk line
noun
: either of a pair of longitudinal ectodermal thickenings in the mammalian embryo that extend from the base of the anterior to the posterior limb buds and are the source of the mammary glands — called also milk line
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012