DAILY UPDATED VOCABULARY WITH PICTURES. BUTTER.

• but‧ter [uncountable]
• 1 a solid yellow food made from milk or cream that you spread on bread or use in cooking ➔ bread-and-butter
• 2

   butter wouldn't melt in somebody's mouth

  used to say that someone seems to be very kind and sincere but is not really
• —buttery adjective

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.