English Etymology From breastfeed + -er or breast + feeder. Pronunciation Audio (US):(file) Noun breastfeeder (plural breastfeeders) A nursing mother, one who breastfeeds (suckles a baby). Synonyms boobfeeder (slang) Derived terms chestfeeder Translations mother who breastfeeds Portuguese: amamentadora f Wikiwand - on Seamless Wikipedia browsing. On steroids.