| obviousness | (noun) the property of being easy to see and understand | Synonyms: noticeability, noticeableness, patency |
|---|
| oca | (noun) South American wood sorrel cultivated for its edible tubers | Synonyms: oka, Oxalis crenata, Oxalis tuberosa |
|---|
| ocarina | (noun) egg-shaped terracotta wind instrument with a mouthpiece and finger holes | Synonyms: sweet potato |
|---|
| occasion | (noun) an event that occurs at a critical time | Synonyms: juncture |
|---|
| (noun) a formal or official social gathering or ceremony of people | Synonyms: affair, function, social affair, social function, social gathering, social occasion |
| (noun) a rational motive for a belief or action | Synonyms: ground, reason |
| (noun) an opportunity to do something | - |
| (noun) the time of a particular event | - |
| occasions | (noun) something you have to do | - |
|---|
| occident | (noun) the hemisphere that includes North America and South America | Synonyms: western hemisphere |
|---|
| occidentalism | (noun) the quality or customs or mannerisms characteristic of Western civilizations | - |
|---|
| occiput | (noun) back part of the head or skull | - |
|---|
| occlusion | (noun) the act of blocking | Synonyms: blockage, closure |
|---|
| (noun) an obstruction in a pipe or tube | Synonyms: block, blockage, closure, stop, stoppage |
| (noun) (dentistry) the normal spatial relation of the teeth when the jaws are closed | - |
| (noun) (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft | Synonyms: occluded front |
| (noun) closure or blockage (as of a blood vessel) | - |
| occlusive | (noun) a consonant produced by stopping the flow of air at some point and suddenly releasing it | Synonyms: plosive, plosive consonant, plosive speech sound, stop, stop consonant |
|---|
| occult | (noun) supernatural practices and techniques | Synonyms: occult arts |
|---|
| (noun) supernatural forces and events and beings collectively | Synonyms: supernatural |
| occultation | (noun) one celestial body obscures another | Synonyms: eclipse |
|---|
| occultism | (noun) a belief in supernatural powers and the possibility of bringing them under human control | - |
|---|
| (noun) the study of the supernatural | - |
| occultist | (noun) a believer in occultism; someone versed in the occult arts | - |
|---|
| occupancy | (noun) an act of being a tenant or occupant | Synonyms: tenancy |
|---|
| (noun) the act of occupying or taking possession of a building | Synonyms: moving in, occupation |
| occupant | (noun) someone who lives at a particular place for a prolonged period or who was born there | Synonyms: occupier, resident |
|---|
| occupation | (noun) the principal activity in your life that you do to earn money | Synonyms: business, job, line, line of work |
|---|
| (noun) the act of occupying or taking possession of a building | Synonyms: moving in, occupancy |
| (noun) the control of a country by military forces of a foreign power | Synonyms: military control |
| (noun) any activity that occupies a person's attention | - |
| (noun) the period of time during which a place or position or nation is occupied | - |
| occupier | (noun) someone who lives at a particular place for a prolonged period or who was born there | Synonyms: occupant, resident |
|---|
| (noun) a member of a military force who is residing in a conquered foreign country | - |
| occurrence | (noun) an event that happens | Synonyms: happening, natural event, occurrent |
|---|
| (noun) an instance of something occurring | - |
| occurrent | (noun) an event that happens | Synonyms: happening, natural event, occurrence |
|---|
| ocean | (noun) a large body of water constituting a principal part of the hydrosphere | - |
|---|
| (noun) anything apparently limitless in quantity or volume | Synonyms: sea |
| oceanaut | (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: aquanaut |
|---|
| oceanfront | (noun) land bordering an ocean | - |
|---|
| oceanographer | (noun) a scientist who studies physical and biological aspects of the seas | - |
|---|
| oceanography | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanology |
|---|
| oceanology | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanography |
|---|
| ocellus | (noun) an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color | Synonyms: eyespot |
|---|
| (noun) an eye having a single lens | Synonyms: simple eye, stemma |
| ocelot | (noun) nocturnal wildcat of Central America and South America having a dark-spotted buff-brown coat | Synonyms: Felis pardalis, panther cat |
|---|
| ocher | (noun) a moderate yellow-orange to orange color | Synonyms: ochre |
|---|
| (noun) any of various earths containing silica and alumina and ferric oxide; used as a pigment | Synonyms: ochre |
| ochlocracy | (noun) a political system in which a mob is the source of control; government by the masses | Synonyms: mobocracy |
|---|
| ochre | (noun) a moderate yellow-orange to orange color | Synonyms: ocher |
|---|
| (noun) any of various earths containing silica and alumina and ferric oxide; used as a pigment | Synonyms: ocher |
| ochronosis | (noun) an accumulation of dark pigment in cartilage and other connective tissue; usually a symptom of alkaptonuria or phenol poisoning | - |
|---|
| ocotillo | (noun) desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers | Synonyms: coachwhip, Fouquieria splendens, Jacob's staff, vine cactus |
|---|
| octad | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octet, octonary, ogdoad, VIII |
|---|
| octagon | (noun) an eight-sided polygon | - |
|---|
| octahedron | (noun) any polyhedron having eight plane faces | - |
|---|
| octameter | (noun) a verse line having eight metrical feet | - |
|---|
| octane | (noun) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent | - |
|---|
| octant | (noun) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration | - |
|---|
| octave | (noun) a musical interval of eight tones | Synonyms: musical octave |
|---|
| (noun) a rhythmic group of eight lines of verse | - |
| (noun) a feast day and the seven days following it | - |
| octavo | (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves | Synonyms: 8vo, eightvo |
|---|
| octet | (noun) a musical composition written for eight performers | Synonyms: octette |
|---|
| (noun) eight people considered as a unit | Synonyms: eightsome, octette |
| (noun) a set of eight similar things considered as a unit | Synonyms: octette |
| (noun) eight performers or singers who perform together | Synonyms: octette |
| (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octonary, ogdoad, VIII |
| octette | (noun) a musical composition written for eight performers | Synonyms: octet |
|---|
| (noun) eight people considered as a unit | Synonyms: eightsome, octet |
| (noun) a set of eight similar things considered as a unit | Synonyms: octet |
| (noun) eight performers or singers who perform together | Synonyms: octet |
| octillion | (noun) the number that is represented as a one followed by 27 zeros | - |
|---|
| octogenarian | (noun) someone whose age is in the eighties | - |
|---|
| octonary | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octet, ogdoad, VIII |
|---|
| octopod | (noun) a cephalopod with eight arms but lacking an internal shell | - |
|---|
| octopus | (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: devilfish |
|---|
| (noun) tentacles of octopus prepared as food | - |
| octoroon | (noun) an offspring of a quadroon and a white parent; a person who is one-eighth black | - |
|---|
| octosyllable | (noun) a verse line having eight syllables or a poem of octosyllabic lines | - |
|---|
| octroi | (noun) a tax on various goods brought into a town | - |
|---|
| ocular | (noun) combination of lenses at the viewing end of optical instruments | Synonyms: eyepiece |
|---|
| oculism | (noun) the craft of an oculist | - |
|---|
| oculist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, ophthalmologist |
|---|
| (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: optometrist |
| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
|---|
| oculus | (noun) the organ of sight | Synonyms: eye, optic |
|---|
| odalisque | (noun) a woman slave in a harem | - |
|---|
| oddball | (noun) a person with an unusual or odd personality | Synonyms: eccentric, eccentric person, flake, geek |
|---|
| oddity | (noun) something unusual -- perhaps worthy of collecting | Synonyms: curio, curiosity, oddment, peculiarity, rarity |
|---|
| (noun) a strange attitude or habit | Synonyms: crotchet, queerness, quirk, quirkiness |
| (noun) eccentricity that is not easily explained | Synonyms: oddness |
| oddment | (noun) a piece of cloth that is left over after the rest has been used or sold | Synonyms: end, remainder, remnant |
|---|
| (noun) something unusual -- perhaps worthy of collecting | Synonyms: curio, curiosity, oddity, peculiarity, rarity |
| oddments | (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, melange, mingle-mangle, mishmash, odds and ends, omnium-gatherum, ragbag |
|---|
| oddness | (noun) eccentricity that is not easily explained | Synonyms: oddity |
|---|
| (noun) the parity of odd numbers (not divisible by two) | - |
| odds | (noun) the likelihood of a thing occurring rather than not occurring | - |
|---|
| (noun) the ratio by which one better's wager is greater than that of another | Synonyms: betting odds |
| ode | (noun) a lyric poem with complex stanza forms | - |
|---|
| odiousness | (noun) the quality of being offensive | Synonyms: distastefulness, offensiveness |
|---|
| odist | (noun) a poet who writes odes | - |
|---|
| odium | (noun) hate coupled with disgust | Synonyms: abhorrence, abomination, detestation, execration, loathing |
|---|
| (noun) state of disgrace resulting from detestable behavior | - |
| odometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, mileometer, milometer |
|---|
| odonate | (noun) large primitive predatory aquatic insect having two pairs of membranous wings | - |
|---|
| odontalgia | (noun) an ache localized in or around a tooth | Synonyms: toothache |
|---|
| odontiasis | (noun) the eruption through the gums of baby teeth | Synonyms: dentition, teething |
|---|
| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
|---|
| odontology | (noun) the branch of medicine dealing with the anatomy and development and diseases of the teeth | Synonyms: dental medicine, dentistry |
|---|
| odor | (noun) any property detected by the olfactory system | Synonyms: aroma, odour, olfactory property, scent, smell |
|---|
| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odour, olfactory perception, olfactory sensation, smell |
| odour | (noun) any property detected by the olfactory system | Synonyms: aroma, odor, olfactory property, scent, smell |
|---|
| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odor, olfactory perception, olfactory sensation, smell |
| odynophagia | (noun) severe pain on swallowing due to a disorder of the esophagus | - |
|---|
| odyssey | (noun) a long wandering and eventful journey | - |
|---|
| oecumenism | (noun) a movement promoting union between religions (especially between Christian churches) | Synonyms: ecumenism |
|---|
| oedema | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: dropsy, edema, hydrops |
|---|
| oedometer | (noun) an instrument for measuring the rate and amount of consolidation of a soil specimen under pressure. | - |
|---|
| oenologist | (noun) a specialist in wine making | Synonyms: enologist, fermentologist |
|---|
| oenology | (noun) the art of wine making | Synonyms: enology |
|---|
| oenomel | (noun) wine mixed with honey | - |
|---|
| oenophile | (noun) someone who appreciates wine | Synonyms: enophile |
|---|
| oersted | (noun) the magnetic field strength 1 cm from a unit magnetic pole | - |
|---|
| oesophagitis | (noun) inflammation of the esophagus; often caused by gastroesophageal reflux | Synonyms: esophagitis |
|---|
| oesophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: esophagoscope |
|---|
| oesophagus | (noun) the passage between the pharynx and the stomach | Synonyms: esophagus, gorge, gullet |
|---|
| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
|---|
| oestriol | (noun) a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency | Synonyms: estriol |
|---|
| 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 |
|---|
| oestrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, theelin |
|---|
| oestrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, rut |
|---|
| oeuvre | (noun) the total output of a writer or artist (or a substantial part of it) | Synonyms: body of work, work |
|---|
| offal | (noun) viscera and trimmings of a butchered animal often considered inedible by humans | - |
|---|
| offbeat | (noun) an unaccented beat (especially the last beat of a measure) | Synonyms: upbeat |
|---|
| offence | (noun) the action of attacking an enemy | Synonyms: offense, offensive |
|---|
| (noun) a transgression that constitutes a violation of what is judged to be right | Synonyms: offense |
| (noun) a lack of politeness; a failure to show regard for others; wounding the feelings of others | Synonyms: discourtesy, offense, offensive activity |
| (noun) a feeling of anger caused by being offended | Synonyms: offense, umbrage |
| (noun) the team that has the ball (or puck) and is trying to score | Synonyms: offense |
| offender | (noun) a person who transgresses moral or civil law | Synonyms: wrongdoer |
|---|
| offense | (noun) the action of attacking an enemy | Synonyms: offence, offensive |
|---|
| (noun) a transgression that constitutes a violation of what is judged to be right | Synonyms: offence |
| (noun) a lack of politeness; a failure to show regard for others; wounding the feelings of others | Synonyms: discourtesy, offence, offensive activity |
| (noun) a feeling of anger caused by being offended | Synonyms: offence, umbrage |
| (noun) the team that has the ball (or puck) and is trying to score | Synonyms: offence |
| offensive | (noun) the action of attacking an enemy | Synonyms: offence, offense |
|---|