Words in english starting with F

• family Pyralididae — Noun – English ～ bee moths; corn borers; flour moths
• food pyramid — Noun – English ～ (ecology) a hierarchy of food chains with the principal predator at the top; each level preys on the level below
• funeral pyre — Noun – English ～ wood heaped for burning a dead body as a funeral rite
• family Pyrolaceae — Noun – English ～ evergreen herbs of temperate regions: genera Pyrola, Chimaphila, Moneses, Orthilia
• family Pyrrhocoridae — Noun – English ～ firebugs
• family Pythiaceae — Noun – English ～ fungi having sporangia usually borne successively and singly at the tips of branching sporangiophores
• family Pythonidae — Noun – English ～ in some classifications a family separate from Boidae comprising Old World boas
• 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

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