IPA: //ˈbʌtəriər//
KK: /ˈbʌtəriər/
Having the qualities or characteristics of butter; smooth, rich, and creamy in texture or flavor.
The sauce was even butterier than I expected, making the dish taste luxurious.
Comparative: butterier
Superlative: butteriest
The word 'butterier' comes from the Old French 'bouterie' (meaning a place where butter is made or stored) and the suffix '-er' (meaning a person who). Thus, a butterier is a person associated with the making or selling of butter.
Think of a 'place where butter is made' ('bouterie') and remember that a butterier is someone who works with butter.