Words in english starting with F

• family Streptomycetaceae — Noun – English ～ higher bacteria typically aerobic soil saprophytes
• family Strigidae — Noun – English ～ a family of nocturnal birds of the order Strigiformes
• first strike — Noun – English ～ the initial use of nuclear weapons to attack a country that also has nuclear weapons; considered feasible only when the attacker can destroy the other country's ability to retaliate; "the Pakistani president promised no first strike against India"
• first-string — Adjective – English ～ being a regular member of a team; "first-string players"
• first-string — Adjective – English ～ of members of a team; not substitutes
• furring strip — Noun – English ～ strip used to give a level surface for attaching wallboard
• flight strip — Noun – English ～ an airfield without normal airport facilities
• four-stroke internal-combustion engine — Noun – English ～ an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
• four-stroke engine — Noun – English ～ an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
• forehand stroke — Noun – English ～ (sports) a return made with the palm of the hand facing the direction of the stroke (as in tennis or badminton or squash)
• family Stromateidae — Noun – English ～ butterfishes: harvest fishes; dollar fishes
• family Strombidae — Noun – English ～ the family of conchs
• family Strophariaceae — Noun – English ～ sometimes included in family Agaricaceae
• fine structure — Noun – English ～ the presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements; "the fine structure results from slightly different energy levels"
• family Struthionidae — Noun – English ～ tall terrestrial birds: ostriches
• field of study — Noun – English ～ a branch of knowledge; "in what discipline is his doctorate?"; "teachers should be well trained in their subject"; "anthropology is the study of human beings"
• family Sturnidae — Noun – English ～ Old World starlings
• family Styracaceae — Noun – English ～ a widely distributed family of shrubs and trees of order Ebenales
• Falco subbuteo — Noun – English ～ small Old World falcon formerly trained and flown at small birds
• Fraxinus pennsylvanica subintegerrima — Noun – English ～ a variety of red ash having glossy branchlets and lower leaf surfaces

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