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founding father (often cap.) one of the delegates to the U.S. Constitutional Convention in 1787. [2 definitions]
foundling a child or infant abandoned by unidentified parents and found by someone else.
found object any object picked up by chance and treated as a piece of art.
foundry an establishment where metal is founded. [2 definitions]
fount a source of water, such as a spring; fountain. [2 definitions]
fountain a spring or head of a stream. [5 definitions]
fountainhead a spring in which a stream has its origin. [2 definitions]
Fountain of Youth a mythical spring believed to give youth and health to anyone who drinks from it.
fountain pen a pen in which ink is drawn into a pointed nib at one end from a reservoir or cartridge inside.
four the number represented by the Arabic numeral 4 and the Roman numeral IV. [3 definitions]
four flush in stud poker, a hand containing four visible cards of one suit.
four-flush in stud poker, to bluff that one has a true flush of five cards on the basis of holding four visible cards of the same suit. [2 definitions]
four-flusher (informal) one without the means to deliver on a promise; one whose position is weak, but who nonetheless presents it as strong; bluffer.
fourfold having four parts or elements. [3 definitions]
four-footed having or walking on four feet; quadruped.
four-four time a musical meter having four quarter notes or their equivalent in each measure.
four-handed having four hands; quadrumanous. [3 definitions]
Four-H club an organization in the U.S. that teaches young people about farming and how to take care of a home. Four-H clubs are so named because they are meant to improve the heads, hearts, hands, and health of their members.
four-in-hand a necktie knotted in a slipknot, with the ends dangling and overlapping in front. [3 definitions]
four-leaf clover a clover with four leaflets, regarded as a sign of good luck.
four-letter word any of several short English words that are considered offensive or obscene.