We don't have synonyms for lactogen yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are lactose, acrogen and lactone.
(n) :
(biochemistry) A polypeptide placental hormone, part of the somatotropin family, with structure and function similar to those of growth hormone. It modifies the metabolic state of the mother during pregnancy to facilitate the energy supply of the fetus.
(n) :
(biochemistry) A polypeptide placental hormone, part of the somatotropin family, with structure and function similar to those of growth hormone. It modifies the metabolic state of the mother during pregnancy to facilitate the energy supply of the fetus.