| frock | (noun) a one-piece garment for a woman; has skirt and bodice | Synonyms: dress |
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| (noun) a habit worn by clerics | - |
| (noun) a long, loose outer garment | - |
| frog | (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, batrachian, salientian, toad, toad frog |
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| (noun) a decorative loop of braid or cord | - |
| (noun) a person of French descent | Synonyms: Gaul |
| frogbit | (noun) European floating plant with roundish heart-shaped leaves and white flowers | Synonyms: frog's-bit, Hydrocharis morsus-ranae |
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| frogfish | (noun) fish having a frog-like mouth with a lure on the snout | - |
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| froghopper | (noun) a variety of spittlebug | - |
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| frogman | (noun) someone who works underwater | Synonyms: diver, underwater diver |
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| frogmouth | (noun) insectivorous bird of Australia and southeastern Asia having a wide frog-like mouth | - |
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| frolic | (noun) gay or light-hearted recreational activity for diversion or amusement | Synonyms: caper, gambol, play, romp |
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| frolicsomeness | (noun) lively high-spirited playfulness | Synonyms: friskiness, sportiveness |
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| frond | (noun) compound leaf of a fern or palm or cycad | - |
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| front | (noun) the side that is seen or that goes first | - |
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| (noun) the outward appearance of a person | - |
| (noun) a group of people with a common ideology who try together to achieve certain general goals | Synonyms: movement, social movement |
| (noun) the side that is forward or prominent | Synonyms: forepart, front end |
| (noun) the line along which opposing armies face each other | Synonyms: battlefront, front line |
| (noun) the part of something that is nearest to the normal viewer | - |
| (noun) the immediate proximity of someone or something | Synonyms: presence |
| (noun) a person used as a cover for some questionable activity | Synonyms: figurehead, front man, nominal head, straw man, strawman |
| (noun) (meteorology) the atmospheric phenomenon created at the boundary between two different air masses | - |
| (noun) a sphere of activity involving effort | - |
| frontage | (noun) the face or front of a building | Synonyms: facade, frontal |
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| (noun) the extent of land abutting on a street or water | - |
| (noun) the direction in which something (such as a building) faces | - |
| frontal | (noun) an adornment worn on the forehead | Synonyms: frontlet |
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| (noun) a drapery that covers the front of an altar | - |
| (noun) the face or front of a building | Synonyms: facade, frontage |
| frontbencher | (noun) a member of the House of Commons who is a minister in the government or who holds an official position in an opposition party | - |
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| frontier | (noun) an undeveloped field of study; a topic inviting research and development | - |
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| (noun) a wilderness at the edge of a settled area of a country | - |
| (noun) an international boundary or the area (often fortified) immediately inside the boundary | - |
| frontiersman | (noun) a man who lives on the frontier | Synonyms: backwoodsman, mountain man |
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| frontierswoman | (noun) a woman who lives on the frontier | - |
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| frontispiece | (noun) front illustration facing the title page of a book | - |
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| (noun) an ornamental facade | - |
| frontlet | (noun) an adornment worn on the forehead | Synonyms: frontal |
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| frontstall | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, chanfron, front-stall, testiere |
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| frost | (noun) weather cold enough to cause freezing | Synonyms: freeze |
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| (noun) the formation of frost or ice on a surface | Synonyms: icing |
| (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: hoar, hoarfrost, rime |
| frostbite | (noun) destruction of tissue by freezing and characterized by tingling, blistering and possibly gangrene | Synonyms: cryopathy |
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| frostiness | (noun) coldness as evidenced by frost | - |
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| (noun) a silvery-white color | Synonyms: hoariness |
| frosting | (noun) a flavored sugar topping used to coat and decorate cakes | Synonyms: ice, icing |
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| frostweed | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostwort, Helianthemum canadense |
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| (noun) tall perennial herb having clusters of white flowers; the eastern United States | Synonyms: frost-weed, Verbesina virginica, Virginia crownbeard |
| frostwort | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostweed, Helianthemum canadense |
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| froth | (noun) a mass of small bubbles formed in or on a liquid | Synonyms: foam |
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| frothiness | (noun) the property of giving off bubbles | Synonyms: bubbliness, effervescence |
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| frottage | (noun) masturbation by rubbing against another person (as in a crowd) | - |
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| frotteur | (noun) someone who masturbates by rubbing against another person (as in a crowd) | - |
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| frown | (noun) a facial expression of dislike or displeasure | Synonyms: scowl |
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