Words starting with F that are validated

• flexible sigmoidoscope — Noun – English ～ an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon
• flexible sigmoidoscopy — Noun – English ～ visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps
• family Sillaginidae — Noun – English ～ small family of small food fishes in shallow waters of the Pacific around Indonesia
• family Siluridae — Noun – English ～ Old World catfishes
• Felis silvestris — Noun – English ～ bushy-tailed wildcat of Europe that resembles the domestic cat and is regarded as the ancestor of the domestic cat
• family Simaroubaceae — Noun – English ～ chiefly tropical trees and shrubs with bitter bark having dry usually one-seeded winged fruit
• fee simple — Noun – English ～ a fee without limitation to any class of heirs; they can sell it or give it away
• Firmiana simplex — Noun – English ～ deciduous tree widely grown in southern United States as an ornamental for its handsome maplelike foliage and long racemes of yellow-green flowers followed by curious leaflike pods
• flight simulator — Noun – English ～ simulator consisting of a machine on the ground that simulates the conditions of flying a plane
• family Simuliidae — Noun – English ～ blackflies and sand flies
• Francis Albert Sinatra — Noun – English ～ United States singer and film actor (1915-1998)
• Frank Sinatra — Noun – English ～ United States singer and film actor (1915-1998)
• folk singer — Noun – English ～ a singer of folk songs
• frontal sinus — Noun – English ～ one of a pair of cavities in the frontal bone
• family Sirenidae — Noun – English ～ sirens
• foster-sister — Noun – English ～ your foster sister is a female who is not a daughter of your parents but who is raised by your parents
• foster sister — Noun – English ～ your foster sister is a female who is not a daughter of your parents but who is raised by your parents
• family Sisyridae — Noun – English ～ an arthropod family of the order Neuroptera that includes spongeflies
• fence-sitter — Noun – English ～ a person who won't take sides in a controversy
• family Sittidae — Noun – English ～ nuthatches

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