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focal length the distance between the optical center of a lens or curved mirror and the far distant point where light rays converge upon an object.
foci a pl. of "focus."
fo'c's'le variant of forecastle.
focus the point at which rays, esp. optical, come together, or from which they seem to radiate. [8 definitions]
focusable combined form of focus.
focusless combined form of focus.
fodder feed for farm animals, such as cut-up cornstalks mixed with hay. [3 definitions]
foe one who wishes ill on another; personal enemy. [5 definitions]
foetal variant of fetal.
foetid variant of fetid.
foetus variant of fetus.
fog a thick cloudlike mass or layer made up of tiny water droplets suspended in the air near the ground. [8 definitions]
fog bank a distinct dense mass of fog, esp. as seen from a distance.
fogbound unable to move because of fog, or surrounded by fog.
foggy full of or covered by fog. [3 definitions]
foghorn a loud, deep-sounding horn, as on a ship, used in fog or at night to give warning signals.
fogless combined form of fog.
fogy someone who has old-fashioned habits, beliefs, or ideas, esp. someone who is also boring (usu. prec. by old).
foible a minor flaw or weakness in personality, character, or behavior. [2 definitions]
foil1 to prevent (a person, plan, enterprise, effort, or the like) from succeeding.
foil2 a very thin flexible sheet of metal such as aluminum. [7 definitions]