| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| first | (noun) the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) | Synonyms: first base |
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| (noun) the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving | Synonyms: first gear, low, low gear |
| (noun) an honours degree of the highest class | Synonyms: first-class honours degree |
| (noun) the first element in a countable series | Synonyms: number 1, number one |
| (noun) the first or highest in an ordering or series | Synonyms: number one |
| (noun) the time at which something is supposed to begin | Synonyms: beginning, commencement, get-go, kickoff, offset, outset, showtime, start, starting time |
| firstborn | (noun) the offspring who came first in the order of birth | Synonyms: eldest |
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| hairstreak | (noun) small butterflies having striped markings under the wings | Synonyms: hairstreak butterfly |
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| hairstyle | (noun) the arrangement of the hair (especially a woman's hair) | Synonyms: coif, coiffure, hair style, hairdo |
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| hairstylist | (noun) someone who cuts or beautifies hair | Synonyms: hairdresser, styler, stylist |
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| thirst | (noun) strong desire for something (not food or drink) | Synonyms: hunger, hungriness, thirstiness |
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| (noun) a physiological need to drink | Synonyms: thirstiness |
| thirster | (noun) a person with a strong desire for something | Synonyms: longer, yearner |
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| thirstiness | (noun) strong desire for something (not food or drink) | Synonyms: hunger, hungriness, thirst |
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| (noun) a physiological need to drink | Synonyms: thirst |
| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridity, aridness |