Words starting with F that are validated

• family Theophrastaceae — Noun – English ～ family of mainly tropical American trees and shrubs similar to those of the Myrsinaceae; often included in the Myrsinaceae
• field theory — Noun – English ～ (physics) a theory that explains a physical phenomenon in terms of a field and the manner in which it interacts with matter or with other fields
• family Theraphosidae — Noun – English ～ large tropical spiders; tarantulas
• family therapy — Noun – English ～ any of several therapeutic approaches in which a family is treated as a whole
• family Theridiidae — Noun – English ～ a family of comb-footed spiders
• first law of thermodynamics — Noun – English ～ the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
• Fahrenheit thermometer — Noun – English ～ a thermometer calibrated in degrees Fahrenheit
• free-thinking — Adjective – English ～ unwilling to accept authority or dogma (especially in religion)
• family Thiobacteriaceae — Noun – English ～ free-living coccoid to rod-shaped bacteria that derive energy from oxidizing sulfur or sulfur compounds
• forty-third — Adjective – English ～ the ordinal number of forty-three in counting order
• field thistle — Noun – English ～ stout North American thistle with purplish-pink flower heads
• Fisch-Thomsen — Last name – Danish
• fire thorn — Noun – English ～ any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries
• freedom of thought — Noun – English ～ the right to hold unpopular ideas
• free thought — Noun – English ～ the form of theological rationalism that believes in God on the basis of reason without reference to revelation
• food for thought — Noun – English ～ anything that provides mental stimulus for thinking
• family Thraupidae — Noun – English ～ tanagers
• forty-three — Adjective – English ～ being three more than forty
• fifty-three — Adjective – English ～ being three more than fifty
• family Threskiornithidae — Noun – English ～ ibises

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