| obstreperousness | (noun) noisy defiance | - |
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| obstructer | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstruction, obstructor |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructionist, obstructor, resister, thwarter |
| obstruction | (noun) getting in someone's way | - |
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| (noun) the act of obstructing | - |
| (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstructor |
| (noun) something immaterial that stands in the way and must be circumvented or surmounted | Synonyms: obstacle |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: blockage |
| obstructionism | (noun) deliberate interference | - |
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| obstructionist | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructor, resister, thwarter |
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| obstructor | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstruction |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, resister, thwarter |
| obstruent | (noun) a consonant that is produced with a partial or complete blockage of the airflow from the lungs through the nose or mouth | - |
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| obtainment | (noun) the act of obtaining | Synonyms: obtention |
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| obtention | (noun) the act of obtaining | Synonyms: obtainment |
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| obtrusiveness | (noun) an unwelcome conspicuousness | - |
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| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
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| obtuseness | (noun) the quality of lacking a sharp edge or point | - |
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| (noun) the quality of being slow to understand | Synonyms: dullness |
| obverse | (noun) the side of a coin or medal bearing the principal stamp or design | - |
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| (noun) the more conspicuous of two alternatives or cases or sides | - |
| obviation | (noun) the act of preventing something by anticipating and disposing of it effectively | Synonyms: forestalling, preclusion |
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| obviousness | (noun) the property of being easy to see and understand | Synonyms: noticeability, noticeableness, patency |
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| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |
| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoblastoma | (noun) benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults) | - |
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| oxyhaemoglobin | (noun) the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs | Synonyms: oxyhemoglobin |
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| oxyhemoglobin | (noun) the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs | Synonyms: oxyhaemoglobin |
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| palaeobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: paleobiology |
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| palaeobotany | (noun) the study of fossil plants | Synonyms: paleobotany |
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| paleobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: palaeobiology |
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| paleobotany | (noun) the study of fossil plants | Synonyms: palaeobotany |
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| pentobarbital | (noun) a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic | Synonyms: Nembutal, pentobarbital sodium, yellow jacket |
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| phenobarbital | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbitone, purple heart, sodium thiopental |
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| phenobarbitone | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbital, purple heart, sodium thiopental |
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| phobia | (noun) an anxiety disorder characterized by extreme and irrational fear of simple things or social situations | Synonyms: phobic disorder, phobic neurosis |
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| phobophobia | (noun) a morbid fear of developing a phobia | - |
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| phonophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: acousticophobia |
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| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| phycobilin | (noun) water-soluble proteinaceous pigments found in red algae and cyanobacteria | - |
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| probabilism | (noun) (philosophy) the doctrine that (since certainty is unattainable) probability is a sufficient basis for belief and action | - |
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| (noun) a Roman Catholic system of casuistry that when expert opinions differ an actor can follow any solidly probable opinion that he wishes even though some different opinion might be more probable | - |
| probability | (noun) the quality of being probable; a probable event or the most probable event | - |
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| (noun) a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible | Synonyms: chance |
| probable | (noun) an applicant likely to be chosen | - |
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| probate | (noun) the act of proving that an instrument purporting to be a will was signed and executed in accord with legal requirements | - |
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| (noun) a judicial certificate saying that a will is genuine and conferring on the executors the power to administer the estate | Synonyms: probate will |
| probation | (noun) (law) a way of dealing with offenders without imprisoning them; a defendant found guilty of a crime is released by the court without imprisonment subject to conditions imposed by the court | - |
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| (noun) a trial period during which an offender has time to redeem himself or herself | - |
| (noun) a trial period during which your character and abilities are tested to see whether you are suitable for work or for membership | - |
| probationer | (noun) someone released on probation or on parole | Synonyms: parolee |
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| (noun) a nurse in training who is undergoing a trial period | Synonyms: student nurse |
| probe | (noun) an exploratory action or expedition | - |
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| (noun) an investigation conducted using a flexible surgical instrument to explore an injury or a body cavity | - |
| (noun) a flexible slender surgical instrument with a blunt end that is used to explore wounds or body cavities | - |
| (noun) an inquiry into unfamiliar or questionable activities | Synonyms: investigation |
| probenecid | (noun) a uricosuric drug that reduces the level of uric acid in the blood; used to treat gout | - |
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| probiotic | (noun) a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant | Synonyms: probiotic bacterium, probiotic flora, probiotic microflora |
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| (noun) A dietary supplement containing live bacteria, usually taken after a course of antibiotics to replenish the damaged gastrointestinal flora. | - |
| probity | (noun) complete and confirmed integrity; having strong moral principles | - |
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| problem | (noun) a source of difficulty | Synonyms: trouble |
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| (noun) a question raised for consideration or solution | - |
| (noun) a state of difficulty that needs to be resolved | Synonyms: job |
| problematics | (noun) the uncertainties or difficulties inherent in a situation or plan. | - |
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| proboscidean | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidian |
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| proboscidian | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidean |
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| proboscis | (noun) a long flexible snout as of an elephant | Synonyms: trunk |
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| (noun) the human nose (especially when it is large) | - |
| pseudobulb | (noun) a solid bulblike enlargement of the stem of some orchids | - |
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| psychobabble | (noun) using language loaded with psychological terminology | - |
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| pyrophobia | (noun) a morbid fear of fire | - |
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| radiobiologist | (noun) a biologist who studies the effects of radiation on living organisms | - |
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| radiobiology | (noun) the branch of biology that studies the effects of radiation on living organisms | - |
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| reprobate | (noun) a person without moral scruples | Synonyms: miscreant |
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| reprobation | (noun) severe disapproval | - |
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| (noun) rejection by God; the state of being condemned to eternal misery in Hell | - |
| retinoblastoma | (noun) malignant ocular tumor of retinal cells; usually occurs before the third year of life; composed of primitive small round retinal cells | - |
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| robalo | (noun) a kind of percoid fish | - |
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| robber | (noun) a thief who steals from someone by threatening violence | - |
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| robbery | (noun) larceny by threat of violence | - |
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| (noun) plundering during riots or in wartime | Synonyms: looting |
| robe | (noun) any loose flowing garment | - |
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| (noun) outerwear consisting of a long flowing garment used for official or ceremonial occasions | Synonyms: gown |
| robin | (noun) large American thrush having a rust-red breast and abdomen | Synonyms: American robin, Turdus migratorius |
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| (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, redbreast, robin redbreast |
| roble | (noun) tall graceful deciduous California oak having leathery leaves and slender pointed acorns | Synonyms: California white oak, Quercus lobata, valley oak, valley white oak |
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| (noun) large tree of Trinidad and Guyana having odd-pinnate leaves and violet-scented axillary racemes of yellow flowers and long smooth pods; grown as a specimen in parks and large gardens | Synonyms: Platymiscium trinitatis |
| robocall | (noun) An phone call made by an automated service | - |
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| robot | (noun) a mechanism that can move automatically | Synonyms: automaton, golem |
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| robotics | (noun) the area of AI concerned with the practical use of robots | - |
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| robustness | (noun) the property of being strong and healthy in constitution | Synonyms: hardiness, lustiness |
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| (noun) the characteristic of being strong enough to withstand intellectual challenge | - |
| saprobe | (noun) an organism that lives in and derives its nourishment from organic matter in stagnant or foul water | - |
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| satanophobia | (noun) an abnormal fear of Satan | - |
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| searobin | (noun) American gurnard; mostly found in bays and estuaries | Synonyms: sea robin |
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| secobarbital | (noun) barbiturate that is a white odorless slightly bitter powder (trade name Seconal) used as a sodium salt for sedation and to treat convulsions | Synonyms: red devil, secobarbital sodium, Seconal |
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| sideboob | (noun) A breast exposed from the side | - |
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| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| skibob | (noun) a vehicle resembling a bicycle but having skis instead of wheels; the rider wears short skis for balancing | - |
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| slob | (noun) a coarse obnoxious person | Synonyms: pig, sloven, slovenly person |
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| slobber | (noun) saliva spilling from the mouth | Synonyms: dribble, drivel, drool |
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| slobberer | (noun) a person who dribbles | Synonyms: dribbler, driveller, drooler |
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| snob | (noun) a person regarded as arrogant and annoying | Synonyms: prig, snoot, snot |
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| snobbery | (noun) the trait of condescending to those of lower social status | Synonyms: snobbishness, snobbism |
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| snobbishness | (noun) the trait of condescending to those of lower social status | Synonyms: snobbery, snobbism |
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| snobbism | (noun) the trait of condescending to those of lower social status | Synonyms: snobbery, snobbishness |
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| snowmobile | (noun) tracked vehicle for travel on snow having skis in front | - |
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| sob | (noun) convulsive gasp made while weeping | Synonyms: sobbing |
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| sobbing | (noun) convulsive gasp made while weeping | Synonyms: sob |
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| soberness | (noun) a manner that is serious and solemn | Synonyms: graveness, gravity, sobriety, somberness, sombreness |
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| (noun) the state of being sober and not intoxicated by alcohol | Synonyms: sobriety |
| sobersides | (noun) a serious and sedate individual | - |
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| sobralia | (noun) any of various showy orchids of the genus Sobralia having leafy stems and bright-colored solitary or racemose flowers similar to those of genus Cattleya | - |
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| sobriety | (noun) abstaining from excess | Synonyms: temperance |
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| (noun) a manner that is serious and solemn | Synonyms: graveness, gravity, soberness, somberness, sombreness |
| (noun) moderation in or abstinence from alcohol or other drugs | Synonyms: dryness |
| (noun) the state of being sober and not intoxicated by alcohol | Synonyms: soberness |
| sobriquet | (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: byname, cognomen, moniker, nickname, soubriquet |
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| sociobiologist | (noun) a biologist who studies the biological determinants of social behavior | - |
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| sociobiology | (noun) the branch of biology that conducts comparative studies of the social organization of animals (including human beings) with regard to its evolutionary history | - |
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| spongioblast | (noun) any of various columnar epithelial cells in the central nervous system that develop into neuroglia | - |
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| spongioblastoma | (noun) a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal | Synonyms: glioblastoma |
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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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| stob | (noun) a short straight stick of wood | - |
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| stockjobber | (noun) one who deals only with brokers or other jobbers | - |
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| streptobacillus | (noun) any of various rod-shaped Gram-negative bacteria | - |
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| strobe | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe light, stroboscope |
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| strobile | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobilus |
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| strobilus | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobile |
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| stroboscope | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe, strobe light |
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| svoboda | (noun) (Russia) freedom | - |
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