| nocent | (adjective) having a tendency to cause harm | - |
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| noctilucent | (adjective) shining or glowing by night | - |
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| nonadjacent | (adjective) not adjacent; not next | - |
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| nonconcentric | (adjective) not having a common center; not concentric | Synonyms: eccentric |
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| noneffervescent | (adjective) not effervescent | - |
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| (adjective) not sparkling | Synonyms: still |
| obsolescent | (adjective) becoming obsolete | - |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| paracentesis | (noun) centesis of the belly to remove fluid for diagnosis | Synonyms: abdominocentesis |
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| patricentric | (adjective) centered upon the father | - |
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| pearlescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, opaline |
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| percent | (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percentage |
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| percentage | (noun) assets belonging to or due to or contributed by an individual person or group | Synonyms: part, portion, share |
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| (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percent |
| percentile | (noun) (statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total | Synonyms: centile |
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| phosphorescent | (adjective) emitting light without appreciable heat as by slow oxidation of phosphorous | - |
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| placenta | (noun) the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus | - |
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| (noun) that part of the ovary of a flowering plant where the ovules form | - |
| placental | (adjective) pertaining to or having or occurring by means of a placenta | - |
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| (noun) mammals having a placenta; all mammals except monotremes and marsupials | Synonyms: eutherian, eutherian mammal, placental mammal |
| placentation | (noun) arrangement of the ovules in the placenta and of the placentas in the ovary | - |
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| (noun) the formation of the placenta in the uterus | - |
| preadolescent | (adjective) of or relating to or designed for children between the ages of 9 and 12 | Synonyms: preteen |
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| precentor | (noun) the musical director of a choir | Synonyms: cantor, choirmaster |
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| precentorship | (noun) the position of precentor | - |
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| prepubescent | (adjective) (especially of human beings) at the age immediately before puberty; often marked by accelerated growth | Synonyms: prepubertal |
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| pubescent | (adjective) covered with fine soft hairs or down | Synonyms: downy, puberulent, sericeous |
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| (adjective) (of animals especially human beings) having arrived at the onset of puberty (the age at which sex glands become functional) but not yet fully mature | - |
| putrescent | (adjective) becoming putrid | - |
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| quatercentenary | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentennial |
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| quatercentennial | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentenary |
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| quattrocento | (noun) the 15th century in Italian art and literature | - |
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| quiescent | (adjective) being quiet or still or inactive | - |
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| (adjective) (pathology) causing no symptoms | - |
| (adjective) not active or activated | - |
| (adjective) marked by a state of tranquil repose | - |
| quincentenary | (adjective) of or relating to a 500th anniversary | Synonyms: quincentennial |
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| (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentennial |
| quincentennial | (adjective) of or relating to a 500th anniversary | Synonyms: quincentenary |
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| (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentenary |
| radiolucent | (adjective) almost complete transparent to X-rays or other forms of radiation | - |
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| recent | (adjective) new | - |
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| (adjective) of the immediate past or just previous to the present time | Synonyms: late |
| recently | (adverb) in the recent past | Synonyms: late, lately, latterly, of late |
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| recentness | (noun) a time immediately before the present | Synonyms: recency |
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| (noun) the property of having happened or appeared not long ago | Synonyms: recency |
| recrudescent | (adjective) the revival of an unfortunate situation after a period of abatement | - |
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| reminiscent | (adjective) serving to bring to mind | Synonyms: evocative, redolent, remindful, resonant |
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| reminiscently | (adverb) in a reminiscent manner | - |
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| renascent | (adjective) rising again as to new life and vigor | Synonyms: resurgent |
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| reticent | (adjective) temperamentally disinclined to talk | Synonyms: untalkative |
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| (adjective) reluctant to draw attention to yourself | Synonyms: retiring, self-effacing |
| (adjective) cool and formal in manner | Synonyms: restrained, unemotional |
| reticently | (adverb) with reticence; in a reticent manner | - |
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| scent | (noun) any property detected by the olfactory system | Synonyms: aroma, odor, odour, olfactory property, smell |
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| (noun) an odor left in passing by which a person or animal can be traced | - |
| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, perfume |
| (verb) apply perfume to | Synonyms: perfume |
| (verb) catch the scent of; get wind of | Synonyms: nose, wind |
| (verb) cause to smell or be smelly | Synonyms: odorize, odourise |
| scented | (adjective) having the sense of smell | - |
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| (adjective) (used in combination) having the odor of | - |
| (adjective) having a natural fragrance | Synonyms: odoriferous, odorous, perfumed, sweet-scented, sweet-smelling, sweet |
| (adjective) filled or impregnated with perfume | Synonyms: perfumed |
| scentless | (adjective) lacking the sense of smell | - |
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| (adjective) emitting or holding no odor | - |
| semicentenary | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentennial |
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| (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentennial |
| semicentennial | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentenary |
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| (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentenary |
| senescent | (adjective) growing old | Synonyms: ageing, aging |
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| sesquicentennial | (noun) the 150th anniversary (or the celebration of it) | - |
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| subjacent | (adjective) lying nearby but lower | - |
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| suffrutescent | (adjective) of a plant; having a woody base that does not die down each year | - |
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| superjacent | (adjective) lying immediately above or on something else | - |
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| telocentric | (adjective) having the form of a straight rod because the centromere is in a terminal position | - |
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| tercentenary | (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentennial, triennial |
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| tercentennial | (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, triennial |
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| theocentrism | (noun) the belief that God is the central aspect to our existence. | - |
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| thoracentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracocentesis |
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| thoracocentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracentesis |
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| translucent | (adjective) allowing light to pass through diffusely | Synonyms: semitransparent |
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| transplacental | (adjective) occurring through or by way of the placenta | - |
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| tricentenary | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentennial |
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| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| tumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, intumescent, puffy, swollen, tumid, turgid |
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| ultracentrifugation | (noun) centrifugation at very high speeds | - |
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| ultracentrifuge | (noun) a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins | - |
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| (verb) subject to the action of an ultracentrifuge | - |
| unaccented | (adjective) (used of syllables) carrying no stress | Synonyms: atonic |
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| (adjective) (used of vowels or syllables) pronounced with little or no stress | Synonyms: light, weak |