agalactia

[New Latin, from Greek agalaktiā, lack of milk : a-, without; see a-¹ + gala, galakt-, milk.]

Failure of the mother to secrete enough milk to feed a suckling infant.

Absence of or faulty secretion of milk following childbirth. Also called agalactosis.

Partial or complete absence of milk flow in the absence of disease of the mammary gland. It may be due to the presence of other disease, to emotional disturbances or to lack of let-down hormones or hormonal stimulation for the development of the mammary glands. See also mastitis–metritis–agalactia, farrowing hysteria.

• contagious ovine/caprine a. — see contagious agalactia.
• primary a. — reduced milk flow is the only abnormality.

The noun has one meaning:

Meaning #1: a condition in which milk is not secreted in the mother's breasts after her child has been delivered
  Synonym: agalactosis