Added 9 October 2026 butterfat /ˈbʌtəfæt/ noun Categories: NatureRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about butterfat at Wordnik → Where our words come from → The fatty substance of milk from which butter is made. Origin From butter + fat. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: butterfatcreambutteroilbutterinemargarinebuttermilk Back to today's word