| QUICKSILVERED | • quicksilvered v. Simple past tense and past participle of quicksilver. • QUICKSILVER v. to coat with quicksilver. |
| QUICKSTEPPING | • quickstepping v. Present participle of quickstep. • QUICKSTEP v. to do the quickstep. |
| QUINCENTENARY | • quincentenary n. Synonym of quincentennial: A 500th anniversary. • quincentenary adj. Synonym of quincentennial: Of or related to a 500th anniversary. • QUINCENTENARY adj. pertaining to a five-hundredth anniversary. |
| QUINCUNCIALLY | • quincuncially adv. In a quincuncial fashion. • QUINCUNCIAL adv. of or like a quincunx, also QUINCUNXIAL. |
| QUINDECAPLETS | • QUINDECAPLET n. a group of fifteen. |
| QUINDECENNIAL | • quindecennial adj. Lasting fifteen years. • quindecennial adj. Happening once in fifteen years. • QUINDECENNIAL n. a fifteenth anniversary. |
| QUINDECILLION | • quindecillion num. (Rare, US, modern Britain and Australia short scale) 1048. • quindecillion num. (Rare, dated, Britain and Australia, long scale) 1090. • QUINDECILLION n. ten to the power of 48, or in Britain ten to the power of 90. |
| QUINGENTENARY | • QUINGENTENARY adj. pertaining to a five-hundredth anniversary. • QUINGENTENARY n. a five-hundredth anniversary, also QUINCENTENARY. |
| QUINQUENNIADS | • quinquenniads n. Plural of quinquenniad. • QUINQUENNIAD n. a period of five years, also QUINQUENNIUM. |
| QUINQUENNIALS | • quinquennials n. Plural of quinquennial. • QUINQUENNIAL n. an anniversary recurring every five years. |
| QUINQUENNIUMS | • quinquenniums n. Plural of quinquennium. • QUINQUENNIUM n. a period of five years, also QUINQUENNIAD. |
| QUINQUEVALENT | • quinquevalent adj. Alternative spelling of quinquivalent. • QUINQUEVALENT adj. having a valency of five, also QUINQUIVALENT. |
| QUINQUIVALENT | • quinquivalent adj. (Chemistry) Having an atomic valence of 5. • quinquivalent adj. (Medicine) Having a vaccine valence of 5. • QUINQUIVALENT adj. having a valency of five, also QUINQUEVALENT. |
| QUINTESSENCES | • quintessences n. Plural of quintessence. • QUINTESSENCE n. the pure, concentrated essence; the most perfect embodiment of something. |
| QUINTILLIONTH | • quintillionth adj. The ordinal form of the number one quintillion. • quintillionth n. The person or thing in the quintillionth position. • quintillionth n. One of a quintillion equal parts of a whole. |
| QUINTUPLICATE | • quintuplicate adj. Multiplied by five. • quintuplicate adj. Being the fifth in a set of five. • quintuplicate n. A set of five similar or identical things. |