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flagellum a whiplike filament extending from certain simple cells, such as reproductive cells or single-celled animals, used mainly for locomotion. [3 definitions]
flageolet a small vertical flute with a fipple, four finger holes, and two thumb holes. [2 definitions]
flagging1 diminishing or drooping, as energy or spirits; weakening.
flagging2 an area paved with flagstones, or the material used for the paving.
flagitious viciously or shamefully wicked; infamous.
flagman one who signals with a flag or light, as on a railroad.
flag of convenience the flag belonging to a foreign nation in which a vessel is registered for the financial convenience of the ship's owner.
flag officer a naval or coast guard officer above the rank of captain, who is entitled to have a special flag displayed when he or she is aboard ship.
flag of truce a white flag displayed to an enemy to indicate a desire to talk together or surrender.
flagon a vessel for serving liquids that has a handle, a spout, and often a top or hinged lid. [2 definitions]
flagpole a pole designed to hold a flag or flags for display; flagstaff.
flagrant exceptionally or glaringly noticeable. [2 definitions]
flagrante delicto (Latin) while the crime is blazing; while the crime is going on; red-handed. [2 definitions]
flagship in a group of naval vessels, the ship in which the commanding officer is stationed, or the principal one of any group of ships. [2 definitions]
flagstaff a pole designed to hold a flag or flags for display; flagpole.
flagstone a type of broad, flat stone used for covering surfaces such as a patio; flag.
flag stop a place where a commercial passenger vehicle stops only if signaled, or stops to let off passengers.
flag-waving excessive or ostentatious display of or appeal to patriotism.
flail a manual implement used to thresh grain, consisting of a long handle with a short, freely moving bar attached at one end. [6 definitions]
flair an innate ability; knack. [2 definitions]
flak antiaircraft fire, esp. the bursting shells of such fire. [2 definitions]