| autofluorescence | (noun) self-induced fluorescence | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| blastoff | (noun) the launching of a missile or spacecraft to a specified destination | Synonyms: shot |
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| cutoff | (noun) a route shorter than the usual one | Synonyms: crosscut, shortcut |
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| (noun) a device that terminates the flow in a pipe | - |
| (noun) a designated limit beyond which something cannot function or must be terminated | - |
| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| heretofore | (adverb) used in negative statement to describe a situation that has existed up to this point or up to the present time | Synonyms: as yet, hitherto, so far, thus far, til now, until now, up to now, yet |
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| lactoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| liftoff | (noun) the initial ascent of a rocket from its launching pad | - |
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| mosquitofish | (noun) silvery topminnow with rows of black spots of tropical North America and West Indies; important in mosquito control | Synonyms: Gambusia affinis |
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| photoflash | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, flashgun |
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| photoflood | (noun) light that is a source of artificial illumination having a broad beam; used in photography | Synonyms: flood, flood lamp, floodlight |
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| putoff | (noun) a pretext for delay or inaction | - |
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| setoff | (noun) structure where a wall or building narrows abruptly | Synonyms: offset, set-back |
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| theretofore | (adverb) up to that time | - |
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| toff | (noun) informal term for an upper-class or wealthy person | Synonyms: nob |
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| toffee | (noun) caramelized sugar cooled in thin sheets | Synonyms: brittle, toffy |
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| toffy | (noun) caramelized sugar cooled in thin sheets | Synonyms: brittle, toffee |
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| tofu | (noun) cheeselike food made of curdled soybean milk | Synonyms: bean curd |
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