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1. A soft yellowish or whitish emulsion of butterfat, water, air, and sometimes salt, churned from milk or cream and processed for use in cooking and as a food.
2. Any of various substances similar to butter, especially:
a. A spread made from fruit, nuts, or other foods: plum butter; cashew butter.
b. A vegetable fat having a nearly solid consistency at ordinary temperatures.
3. Flattery.
tr.v. but·tered, but·ter·ing, but·ters
To put butter on or in.
Phrasal Verb:
butter up
To praise or flatter excessively: You're always buttering up the boss.

[Middle English butere, from Old English, from Latin būtȳrum, from Greek boutūron : bous, cow; see gwou- in Indo-European roots + tūros, cheese; see teuə- in Indo-European roots.]


(Cookery) having had butter spread over or applied to it
References in classic literature ?
I never ceased to be fascinated by their persistence in eating buttered toast with their gloves on, and I observed with admiration the unconcern with which they wiped their fingers on their chair when they thought no one was looking.
I wish yer'd ordered her to make some buttered toast first.
15 0 94% Fat Free, Butter Pop Secret Light Butter 20 1 Pop-Secret 94% Fat Free, Butter 20 0 ([check]) Smart Balance Smart 'N Healthy 20 0 BUTTERED ACT II Butter Lovers 35 2.
Turn into buttered steam-type (about 5- to 6-cup) covered mold.
Place asparagus pasta on a buttered sheet pan, brush tops with melted butter and sprinkle with cheese.
This year, Long John Silver's is introducing Buttered Lobster Bites(TM), made with real langostino lobster.