(chiefly historical) A product made by cleaning (for example, by melting and draining the liquid milk fat off of) impure or rancid butter.

plural of button mushroom

Alternative form of see the forest for the trees

A form of butter aerated with nitrogen to make it more spreadable.

plural of butcher bird

(obsolete) buttercup

(shipbuilding) A method of working long tapering planks by bringing the but of one plank to the top of the other to make up a constant breadth in two layers.

Any of several gelatinous organisms, such as Tremella mesenterica, Nostoc commune and Exidia glandulosa.

(colloquial, idiomatic, dated) headfirst with full force

(pharmacology) An organic phosphorus compound used as a drug in animals.