a.Astronomy, pertaining to a galaxy. galactagogue, n. & a. (substance) promoting milk secretion. galactoid, a. milk-like. galactometer, n. instrument measuring density of milk. galactophore, n. milk duct. galactopherous, a. conveying milk. galactophygous, a. preventing milk secretion. galactopoiesis, n. milk production and secretion. galactopoietic, a.galactorrhoea, n. excessive milk flow.