| aneuploid | (adjective) having a chromosome number that is not an exact multiple of the haploid number | - |
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| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
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| couple | (noun) a pair who associate with one another | Synonyms: duet, duo, twosome |
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| (noun) a pair of people who live together | Synonyms: match, mates |
| (noun) (physics) something joined by two equal and opposite forces that act along parallel lines | - |
| (noun) two items of the same kind | Synonyms: brace, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| (noun) a small indefinite number | - |
| (verb) engage in sexual intercourse | Synonyms: copulate, mate, pair |
| (verb) link together | Synonyms: couple on, couple up |
| (verb) bring two objects, ideas, or people together | Synonyms: match, mate, pair, twin |
| (verb) form a pair or pairs | Synonyms: pair, pair off, partner off |
| coupled | (adjective) connected by a link, as railway cars or trailer trucks | Synonyms: joined, linked |
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| (adjective) joined together especially in a pair or pairs | Synonyms: conjugate, conjugated |
| coupler | (noun) a mechanical device that serves to connect the ends of adjacent objects | Synonyms: coupling |
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| couplet | (noun) a stanza consisting of two successive lines of verse; usually rhymed | - |
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| (noun) two items of the same kind | Synonyms: brace, couple, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| coupling | (noun) the act of pairing a male and female for reproductive purposes | Synonyms: conjugation, mating, pairing, sexual union, union |
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| (noun) a mechanical device that serves to connect the ends of adjacent objects | Synonyms: coupler |
| (noun) a connection (like a clamp or vise) between two things so they move together | Synonyms: yoke |
| cuplike | (adjective) resembling the shape of a cup | - |
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| decouple | (verb) reduce or eliminate the coupling of (one circuit or part to another) | - |
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| (verb) eliminate airborne shock waves from (an explosive) | - |
| (verb) regard as unconnected | Synonyms: dissociate |
| (verb) disconnect or separate | Synonyms: uncouple |
| duple | (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: double, dual |
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| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| (verb) change into a duplex | - |
| duplicability | (noun) the quality of being reproducible | Synonyms: reproducibility |
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| duplicable | (adjective) capable of being duplicated | Synonyms: duplicatable |
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| duplicatable | (adjective) capable of being duplicated | Synonyms: duplicable |
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| duplicate | (adjective) being two identical | Synonyms: matching, twin, twinned |
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| (adjective) identically copied from an original | - |
| (noun) a copy that corresponds to an original exactly | Synonyms: duplication |
| (noun) something additional of the same kind | Synonyms: extra |
| (verb) increase twofold | Synonyms: double |
| (verb) make or do or perform again | Synonyms: double, reduplicate, repeat, replicate |
| (verb) make a duplicate or duplicates of | - |
| (verb) duplicate or match | Synonyms: parallel, twin |
| duplication | (noun) the act of copying or making a duplicate (or duplicates) of something | Synonyms: gemination |
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| (noun) a copy that corresponds to an original exactly | Synonyms: duplicate |
| duplicator | (noun) apparatus that makes copies of typed, written or drawn material | Synonyms: copier |
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| duplicitous | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, deceitful, double-dealing, double-faced, double-tongued, Janus-faced, two-faced |
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| duplicity | (noun) acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another | Synonyms: double-dealing |
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| (noun) a fraudulent or duplicitous representation | Synonyms: fraudulence |
| nonuple | (adjective) having nine units or components | Synonyms: nine-fold, ninefold |
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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| (noun) a quantity that is four times as great as another | - |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| (verb) increase fourfold | - |
| quadruplet | (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quartet, quartette |
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| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quad |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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| (noun) any four copies; any of four things that correspond to one another exactly | - |
| (verb) reproduce fourfold | - |
| quadrupling | (noun) increase by a factor of four | - |
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| quintuple | (adjective) having five units or components | Synonyms: five-fold, fivefold |
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| (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuplet |
| (verb) increase fivefold | - |
| quintuplet | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuple |
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| (noun) one of five children born at the same time from the same pregnancy | Synonyms: quin, quint |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, V |
| quintupling | (noun) increasing by a factor of five | - |
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| reduplicate | (verb) make or do or perform again | Synonyms: double, duplicate, repeat, replicate |
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| (verb) form by reduplication | Synonyms: geminate |
| reduplication | (noun) the act of repeating over and again (or an instance thereof) | Synonyms: reiteration |
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| (noun) a word formed by or containing a repeated syllable or speech sound (usually at the beginning of the word) | - |
| (noun) the syllable added in a reduplicated word form | - |
| (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: anadiplosis |
| scruple | (noun) an ethical or moral principle that inhibits action | - |
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| (noun) uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety) | Synonyms: misgiving, qualm |
| (noun) a unit of apothecary weight equal to 20 grains | - |
| (verb) have doubts about | - |
| (verb) raise scruples | - |
| (verb) hesitate on moral grounds | - |
| scruples | (noun) motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions | Synonyms: conscience, moral sense, sense of right and wrong |
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| septuple | (adjective) having seven units or components | Synonyms: seven-fold, sevenfold |
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| sextuple | (adjective) having six units or components | Synonyms: six-fold, sixfold |
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| sextuplet | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sestet, sextet, sise, six, sixer, VI |
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| thermocouple | (noun) a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference | Synonyms: thermocouple junction |
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| uncouple | (verb) disconnect or separate | Synonyms: decouple |
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| uncoupled | (adjective) having the coupling undone | - |
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| upland | (adjective) used of high or hilly country | Synonyms: highland |
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| (noun) elevated (e.g., mountainous) land | Synonyms: highland |
| uplift | (noun) a brassiere that lifts and supports the breasts | - |
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| (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: upheaval, upthrow, upthrust |
| (verb) fill with high spirits; fill with optimism | Synonyms: elate, intoxicate, lift up, pick up |
| (verb) lift up or elevate | - |
| (verb) lift up from the earth, as by geologic forces | - |
| uplifted | (adjective) exalted emotionally especially with pride | - |
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| uplifting | (noun) the rise of something | - |
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| uplink | (noun) a transmission from Earth to a spacecraft or the path of such a transmission | - |
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| upload | (verb) transfer a file or program to a central computer from a smaller computer or a computer at a remote location | - |
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