Fraxinus quadrangulata
— Noun
– English
~ ash of central and southern United States with bluish-green foliage and hard brown wood
fundamental quantity
— Noun
– English
~ one of the four quantities that are the basis of systems of measurement
first quarter
— Noun
– English
~ the first fourth of the Moon's period of revolution around the Earth
flowering quince
— Noun
– English
~ Asiatic ornamental shrub with spiny branches and pink or red blossoms
Francois Rabelais
— Noun
– English
~ author of satirical attacks on medieval scholasticism (1494-1553)
foot race
— Noun
– English
~ a race run on foot; "she broke the record for the half-mile run"
family Rachycentridae
— Noun
– English
~ family of pelagic fishes containing solely the cobia
fire control radar
— Noun
– English
~ naval radar that controls the delivery of fire on a military target
full radiator
— Noun
– English
~ a hypothetical object capable of absorbing all the electromagnetic radiation falling on it; "a black body maintained at a constant temperature is a full radiator at that temperature because the radiation reaching and leaving it must be in equilibrium"
free radical
— Noun
– English
~ an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells"
Father of Radio
— Noun
– English
~ United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961)
family Rafflesiaceae
— Noun
– English
~ a family of parasitic plants of the order Aristolochiales
false ragweed
— Noun
– English
~ tall annual marsh elder common in moist rich soil in central North America that can cause contact dermatitis; produces much pollen that is a major cause of hay fever
fence rail
— Noun
– English
~ a rail that is split from a log
fife rail
— Noun
– English
~ the railing surrounding the mast of a sailing vessel
funicular railway
— Noun
– English
~ a railway up the side of a mountain pulled by a moving cable and having counterbalancing ascending and descending cars