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focalize in medicine, to limit or be limited to a specific area, as an infection; localize.
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.
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]