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reductio ad absurdum (Latin) the disproof of a proposition by demonstrating the impossibility or absurdity of its logical conclusion.
reduction the act of reducing or state of being reduced. [5 definitions]
reductionist indicating the oversimplification of complex ideas or data.
reductive relating to or characterized by reducing or abridgment. [2 definitions]
redundancy the state or quality of being redundant. [4 definitions]
redundant unnecessarily repetitive. [3 definitions]
reduplicate to repeat or duplicate. [5 definitions]
reduplication the act of reduplicating or the state of being reduplicated. [2 definitions]
redux brought back; returned (used after a noun rather than before).
redwing see red-winged blackbird. [2 definitions]
red-winged blackbird a North American blackbird, the male of which has bright red patches on its wings.
redwood a very tall, long-lived evergreen tree found in northern California. [2 definitions]
reecho of a sound, to echo again; reverberate; resound. [3 definitions]
reed any of various tall marsh grasses or their straight, jointed, hollow stalks. [3 definitions]
reeding small convex moldings, as on a column.
reed instrument any musical instrument, such as the clarinet, oboe, or bassoon, in which the sound is produced by a vibrating reed or reeds.
reed organ an organ in which the sound is produced by a set of free, vibrating metal reeds instead of pipes.
reed pipe an organ pipe containing a reed that vibrates when struck by air currents and thus produces sound.
reed stop a set of organ pipes operated by a single stop or knob.
reeducate to educate again; retrain; reinstruct; rehabilitate.
reedy full of, made of, or resembling reeds. [2 definitions]