| COUNTERFORT | • counterfort n. A buttress built against a wall. • counterfort n. A spur of a mountain range. • COUNTERFORT n. a buttress or arch supporting a retaining wall. |
| FETOPROTEIN | • fetoprotein n. (Biochemistry) Any of several antigens produced in a developing embryo, of which the most common is alpha-fetoprotein. • FETOPROTEIN n. any of several fetal antigens present in the adult in some abnormal conditions. |
| FOOTBREADTH | • footbreadth n. The breadth of a foot; used as a measure. • FOOTBREADTH n. the width of a foot. |
| FOOTLAMBERT | • footlambert n. Alternative form of foot-lambert. • foot-lambert n. A unit of luminance equal to 1/π candela per square foot, or 3.426 candela per square meter. • FOOTLAMBERT n. a unit of luminance of a surface emitting one lumen per square foot. |
| FORESTATION | • forestation n. The act of planting a forest. • forestation n. The conversion of a habitat to forest. • FORESTATION n. the creation of forest. |
| FORETHOUGHT | • forethought n. Thinking beforehand or in advance, planning; prior or previous consideration; premeditation. • forethought n. Anticipation. • forethought n. Provident care; prudence. |
| FORETOPMAST | • foretopmast n. (Nautical) The mast above the foretop. • FORETOPMAST n. the mast above the foretop platform. |
| FOXTROTTING | • foxtrotting v. Present participle of foxtrot. • FOXTROT v. to dance in a particular way with a partner. |
| FRITHSTOOLS | • frithstools n. Plural of frithstool. • frith␣stools n. Plural of frith stool. • FRITHSTOOL n. a seat in churches near the altar, to which offenders formerly fled for sanctuary. |
| FRONTCOURTS | • frontcourts n. Plural of frontcourt. • FRONTCOURT n. a basketball team's offensive half of the court. |
| ROTORCRAFTS | • rotorcrafts n. Plural of rotorcraft. • ROTORCRAFT n. a helicopter or autogyro. |
| STOREFRONTS | • storefronts n. Plural of storefront. • STOREFRONT n. the front side of a store or store building facing a street. |
| TENDERFOOTS | • tenderfoots n. Plural of tenderfoot. • TENDERFOOT n. a newcomer in a comparatively rough or newly settled region. |
| THERETOFORE | • theretofore adv. Until that time. • theretofore adv. Before that. • THERETOFORE adv. up to that time. |
| TORTFEASORS | • tortfeasors n. Plural of tortfeasor. • TORTFEASOR n. a person guilty of tort, a wrongful act, damage, or injury done willfully. |
| UNFORGOTTEN | • unforgotten adj. Not forgotten; still remembered. • unforgotten v. Past participle of unforget. • un-forgotten v. Past participle of un-forget. |