Navneord der begynder med F

• focal length — Navneord – Engelsk ～ the distance from a lens to its focus
• family Lennoaceae — Navneord – Engelsk ～ family of fleshy parasitic herbs lacking green foliage and having heads of small flowers; California and Mexico
• fisheye lens — Navneord – Engelsk ～ a camera lens having a wider than normal angle of view (and usually a short focal length); produces an image that is foreshortened in the center and increasingly distorted in the periphery
• Fresnel lens — Navneord – Engelsk ～ lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length
• field lens — Navneord – Engelsk ～ the lens that is farthest from the eye in an optical device with more than one lens
• family Lentibulariaceae — Navneord – Engelsk ～ carnivorous aquatic or bog plants: genera Utricularia, Pinguicula, and Genlisea
• family Lepadidae — Navneord – Engelsk ～ goose barnacles
• family Lepidobotryaceae — Navneord – Engelsk ～ family created in 1950 solely for the classification of a distinctive African tree repeatedly classified in other families; trees long believed to exist only in Africa
• family Lepidodendraceae — Navneord – Engelsk ～ fossil plants characterized by conspicuous spirally arranged leaf scars on the trunk
• family Lepiotaceae — Navneord – Engelsk ～ a family of fungi having free gills and a cap that is cleanly separable from the stalk
• family Lepismatidae — Navneord – Engelsk ～ firebrats
• family Lepisosteidae — Navneord – Engelsk ～ comprises the genus Lepisosteus
• family Leporidae — Navneord – Engelsk ～ hares and rabbits
• family Leptodactylidae — Navneord – Engelsk ～ New World frogs; in some classifications essentially coextensive with the family Bufonidae
• family Leptotyphlopidae — Navneord – Engelsk ～ blind snakes
• Ferdinand de Lesseps — Navneord – Engelsk ～ French diplomat who supervised the construction of the Suez Canal (1805-1894)
• French lesson — Navneord – Engelsk ～ instruction in the French language
• fan letter — Navneord – Engelsk ～ a letter that is a piece of fan mail
• form letter — Navneord – Engelsk ～ a letter that is printed in multiple copies and mailed to a list of recipients
• frog's lettuce — Navneord – Engelsk ～ very similar to Potamogeton; of western Africa, Asia, and Europe

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