| oestrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: estrogen |
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| oncogene | (noun) a gene that disposes normal cells to change into cancerous tumor cells | Synonyms: transforming gene |
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| ontogenesis | (noun) (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level | Synonyms: development, growing, growth, maturation, ontogeny |
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| ontogenetic | (adjective) of or relating to the origin and development of individual organisms | - |
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| ontogeny | (noun) (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level | Synonyms: development, growing, growth, maturation, ontogenesis |
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| oogenesis | (noun) development of ova | - |
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| orangeness | (noun) orange color or pigment; any of a range of colors between red and yellow | Synonyms: orange |
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| orogeny | (noun) the process of mountain formation (especially by the upward displacement of the earth's crust) | - |
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| outgeneral | (verb) surpass in generalship | - |
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| overgeneralise | (verb) draw too general a conclusion | Synonyms: overgeneralize |
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| overgeneralize | (verb) draw too general a conclusion | Synonyms: overgeneralise |
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| overgenerous | (adjective) very generous | Synonyms: lavish, munificent, too-generous, unsparing, unstinted, unstinting |
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| overindulgence | (noun) excessive indulgence | Synonyms: excess |
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| overindulgent | (adjective) excessively indulgent | - |
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| oxygen | (noun) a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust | Synonyms: atomic number 8, O |
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| oxygenase | (noun) an oxidoreductase that catalyzes the incorporation of molecular oxygen | - |
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| oxygenate | (verb) impregnate, combine, or supply with oxygen | Synonyms: aerate, oxygenise, oxygenize |
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| oxygenation | (noun) the process of providing or combining or treating with oxygen | - |
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| oxygenise | (verb) impregnate, combine, or supply with oxygen | Synonyms: aerate, oxygenate, oxygenize |
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| (verb) dehydrogenate with oxygen | Synonyms: oxygenize |
| (verb) change (a compound) by increasing the proportion of the electronegative part; or change (an element or ion) from a lower to a higher positive valence: remove one or more electrons from (an atom, ion, or molecule) | Synonyms: oxygenize |
| oxygenize | (verb) impregnate, combine, or supply with oxygen | Synonyms: aerate, oxygenate, oxygenise |
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| (verb) dehydrogenate with oxygen | Synonyms: oxygenise |
| (verb) change (a compound) by increasing the proportion of the electronegative part; or change (an element or ion) from a lower to a higher positive valence: remove one or more electrons from (an atom, ion, or molecule) | Synonyms: oxygenise |
| palingenesis | (noun) emergence during embryonic development of various characters or structures that appeared during the evolutionary history of the strain or species | Synonyms: recapitulation |
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| palingenetic | (adjective) of or relating to palingenesis | - |
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| pangen | (noun) a hypothetical heredity-controlling particle of protoplasm. | - |
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| parthenogenesis | (noun) process in which an unfertilized egg develops into a new individual; common among insects and some other arthropods | Synonyms: parthenogeny |
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| (noun) human conception without fertilization by a man | Synonyms: parthenogeny, virgin birth |
| parthenogenetic | (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, agamous, apomictic |
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| parthenogeny | (noun) process in which an unfertilized egg develops into a new individual; common among insects and some other arthropods | Synonyms: parthenogenesis |
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| (noun) human conception without fertilization by a man | Synonyms: parthenogenesis, virgin birth |
| pathogen | (noun) any disease-producing agent (especially a virus or bacterium or other microorganism) | - |
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| pathogenesis | (noun) the origination and development of a disease | - |
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| pathogenic | (adjective) able to cause disease | Synonyms: infective, morbific |
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| pathogenically | (adverb) in a pathogenic manner | - |
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| pepsinogen | (noun) precursor of pepsin; stored in the stomach walls and converted to pepsin by hydrochloric acid in the stomach | - |
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| pharmacogenetics | (noun) the branch of genetics that studies the genetically determined variations in responses to drugs in humans or laboratory organisms | - |
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| phosgene | (noun) a colorless poisonous gas that smells like new-mown hay; used in chemical warfare | - |
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| photogenic | (adjective) looking attractive in photographs | - |
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| phylogenesis | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogeny |
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| phylogenetic | (adjective) of or relating to the evolutionary development of organisms | Synonyms: phyletic |
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| phylogenetically | (adverb) with regard to phylogeny | - |
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| phylogeny | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogenesis |
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| plangency | (noun) having the character of a loud deep sound; the quality of being resonant | Synonyms: resonance, reverberance, ringing, sonority, sonorousness, vibrancy |
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| plangent | (adjective) loud and resounding | - |
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| plasminogen | (noun) an inactive form of plasmin that occurs in plasma and is converted to plasmin by organic solvents | - |
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| polygene | (noun) a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations | - |
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| polygenic | (adjective) of or relating to an inheritable character that is controlled by several genes at once; of or related to or determined by polygenes | - |
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| primogenitor | (noun) an ancestor in the direct line | Synonyms: progenitor |
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| primogeniture | (noun) right of inheritance belongs exclusively to the eldest son | - |
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| progenitor | (noun) an ancestor in the direct line | Synonyms: primogenitor |
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| progeny | (noun) the immediate descendants of a person | Synonyms: issue, offspring |
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| progestogen | (noun) any of a group of steroid hormones that have the effect of progesterone | Synonyms: progestin |
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| psychogenesis | (noun) a general term for the origin and development of almost any aspect of the mind | - |
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| (noun) the development in the life of an individual of some disorder that is caused by psychological rather than physiological factors | - |
| psychogenetic | (adjective) of or relating to the origin and development of the mind | - |
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| (adjective) of or relating to the psychological cause of a disorder | Synonyms: psychogenic |
| psychogenic | (adjective) of or relating to the psychological cause of a disorder | Synonyms: psychogenetic |
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| (adjective) mental or emotional rather than physiological in origin | - |
| pungency | (noun) a strong odor or taste property | Synonyms: bite, raciness, sharpness |
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| (noun) wit having a sharp and caustic quality | Synonyms: bite |
| pungent | (adjective) capable of wounding | Synonyms: barbed, biting, mordacious, nipping |
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| (adjective) strong and sharp | Synonyms: acrid |
| pungently | (adverb) with a pungent taste or smell | - |
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| (adverb) with pungency; in a pungent manner | - |
| pyogenic | (adjective) producing pus | - |
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| pyrogen | (noun) any substance that can cause a rise in body temperature | Synonyms: pyrectic |
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| (noun) any substance characterized by its great flammability | - |
| pyrogenetic | (adjective) produced by or producing fever | Synonyms: pyrogenic, pyrogenous |
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| pyrogenic | (adjective) produced under conditions involving intense heat | Synonyms: igneous, pyrogenous |
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| (adjective) produced by or producing fever | Synonyms: pyrogenetic, pyrogenous |
| pyrogenous | (adjective) produced under conditions involving intense heat | Synonyms: igneous, pyrogenic |
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| (adjective) produced by or producing fever | Synonyms: pyrogenetic, pyrogenic |
| reagent | (noun) a chemical agent for use in chemical reactions | - |
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| refulgence | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, radiancy, refulgency, shine |
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| refulgency | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, radiancy, refulgence, shine |
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| refulgent | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, radiant |
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| regency | (noun) the office of a regent | - |
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| (noun) the period of time during which a regent governs | - |
| regenerate | (adjective) reformed spiritually or morally | - |
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| (verb) restore strength | Synonyms: revitalize |
| (verb) undergo regeneration | - |
| (verb) form or produce anew | - |
| (verb) get or give new life or energy; return to life, regain energy, recuperate | Synonyms: rejuvenate, restore |
| (verb) replace (tissue or a body part) through the formation of new tissue | - |
| (verb) be formed or shaped anew | - |
| (verb) bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one | Synonyms: reclaim, rectify, reform |
| (verb) amplify (an electron current) by causing part of the power in the output circuit to act upon the input circuit | - |
| (verb) reestablish on a new, usually improved, basis or make new or like new | Synonyms: renew |
| regenerating | (adjective) that are generating anew | - |
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| regeneration | (noun) the activity of spiritual or physical renewal | - |
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| (noun) forming again (especially with improvements or removal of defects); renewing and reconstituting | Synonyms: re-formation |
| (noun) (biology) growth anew of lost tissue or destroyed parts or organs | - |
| (noun) feedback in phase with (augmenting) the input | Synonyms: positive feedback |
| regent | (adjective) acting or functioning as a regent or ruler | - |
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| (noun) someone who rules during the absence or incapacity or minority of the country's monarch | - |
| (noun) members of a governing board | Synonyms: trustee |
| resurgence | (noun) bringing again into activity and prominence | Synonyms: revitalisation, revitalization, revival, revivification |
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| resurgent | (adjective) rising again as to new life and vigor | Synonyms: renascent |
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| roentgen | (noun) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air | Synonyms: R |
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| roentgenium | (noun) a radioactive transuranic element, with atomic number 111 | Synonyms: atomic number 111, element 111, Rg |
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| roentgenogram | (noun) a radiogram made by exposing photographic film to X rays; used in medical diagnosis | Synonyms: X-ray, X-ray photograph, X-ray picture, X ray |
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| roentgenographic | (adjective) relating to or produced by roentgenography | - |
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| roentgenography | (noun) radiography that uses X-rays to produce a roentgenogram | Synonyms: X-ray photography |
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| roentgenoscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: fluoroscope |
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| saligenin | (noun) Salicylic alcohol, also called saligenin, is a crystalline phenolic alcohol with the chemical formula C7H8O2, that is obtained usually by hydrolysis of salicin. | Synonyms: salicylic alcohol |
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| savageness | (noun) the property of being untamed and ferocious | Synonyms: savagery |
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| septuagenarian | (noun) someone whose age is in the seventies | - |
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| sexagenarian | (adjective) being from 60 to 69 years old | - |
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| (noun) someone whose age is in the sixties | - |
| smidgen | (noun) a tiny or scarcely detectable amount | Synonyms: iota, scintilla, shred, smidge, smidgeon, smidgin, tittle, whit |
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| somatogenetic | (adjective) of or arising from physiological causes rather than being psychogenic in origin | Synonyms: somatogenic |
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| somatogenic | (adjective) of or arising from physiological causes rather than being psychogenic in origin | Synonyms: somatogenetic |
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| spermatogenesis | (noun) development of spermatozoa | - |
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| sporogenous | (adjective) producing spores or reproducing by means of spores | - |
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| stercobilinogen | (noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine | Synonyms: urobilinogen |
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| strangeness | (noun) unusualness as a consequence of not being well known | Synonyms: unfamiliarity |
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| (noun) the quality of being alien or not native | Synonyms: curiousness, foreignness |
| (noun) (physics) one of the six flavors of quark, the third lightest of all quarks | - |
| stringency | (noun) conscientious attention to rules and details | Synonyms: strictness |
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| (noun) a state occasioned by scarcity of money and a shortage of credit | Synonyms: tightness |
| stringent | (adjective) demanding strict attention to rules and procedures | Synonyms: rigorous, tight |
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| stringently | (adverb) in a stringent manner | Synonyms: strictly |
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| subgenus | (noun) (biology) taxonomic group between a genus and a species | - |
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| submergence | (noun) sinking until covered completely with water | Synonyms: immersion, submerging, submersion |
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| superintelligence | (noun) Remarkable intelligence, intelligence at or above and beyond the level of a genius. | Synonyms: hyperintelligence |
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| tangency | (noun) (electronics) a junction where things (as two electrical conductors) touch or are in physical contact | Synonyms: contact |
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| (noun) the state of being tangent; having contact at a single point or along a line without crossing | - |
| tangent | (noun) ratio of the opposite to the adjacent side of a right-angled triangle | Synonyms: tan |
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| (noun) a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point | - |
| tangential | (adjective) of or relating to or acting along or in the direction of a tangent | - |
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| (adjective) of superficial relevance if any | Synonyms: digressive |
| tangentially | (adverb) peripherally | - |
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| teratogen | (noun) any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples | - |
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| teratogenesis | (noun) the development of defects in an embryo | - |
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| teratogenic | (adjective) of or relating to substances or agents that can interfere with normal embryonic development | - |
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