| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| libretto | (noun) the words of an opera or musical play | - |
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| libtard | (noun) A pejorative term for a liberal | - |
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| mandible | (noun) the jaw in vertebrates that is hinged to open the mouth | Synonyms: jawbone, jowl, lower jaw, lower jawbone, mandibula, mandibular bone, submaxilla |
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| mandibula | (noun) the jaw in vertebrates that is hinged to open the mouth | Synonyms: jawbone, jowl, lower jaw, lower jawbone, mandible, mandibular bone, submaxilla |
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| matrisib | (noun) one related on the mother's side | Synonyms: enate, matrikin, matrilineal kin, matrilineal sib |
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| mebibit | (noun) a unit of information equal to 1024 kibibits or 2^20 (1,048,576) bits | Synonyms: Mibit |
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| mebibyte | (noun) a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes | Synonyms: M, MB, megabyte, MiB |
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| memsahib | (noun) a woman sahib | - |
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| midrib | (noun) the vein in the center of a leaf | Synonyms: midvein |
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| millibar | (noun) a unit of atmospheric pressure equal to one thousandth of a bar | - |
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| minibar | (noun) sideboard with compartments for holding bottles | Synonyms: cellaret |
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| minibike | (noun) small motorcycle with a low frame and small wheels and elevated handlebars | Synonyms: motorbike |
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| minibus | (noun) a light bus (4 to 10 passengers) | - |
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| myelofibrosis | (noun) fibrosis of the bone marrow | - |
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| myofibril | (noun) one of many contractile filaments that make up a striated muscle fiber | Synonyms: myofibrilla, sarcostyle |
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| myofibrilla | (noun) one of many contractile filaments that make up a striated muscle fiber | Synonyms: myofibril, sarcostyle |
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| neoliberal | (noun) a liberal who subscribes to neoliberalism | - |
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| neoliberalism | (noun) a political orientation originating in the 1960s; blends liberal political views with an emphasis on economic growth | - |
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| neurofibril | (noun) Any of the long, thin, microscopic fibrils that run through the body of a neuron and extend into the axon and dendrites, giving the neuron support and shape. | - |
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| neurofibroma | (noun) tumor of the fibrous covering of a peripheral nerve | Synonyms: neurilemoma |
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| neurofibromatosis | (noun) autosomal dominant disease characterized by numerous neurofibromas and by spots on the skin and often by developmental abnormalities | Synonyms: von Recklinghausen's disease |
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| nib | (noun) horny projecting mouth of a bird | Synonyms: beak, bill, neb, pecker |
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| (noun) the writing point of a pen | Synonyms: pen nib |
| nibble | (noun) gentle biting | - |
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| (noun) a small byte | Synonyms: nybble |
| nibbler | (noun) a biter who takes dainty repeated bites | - |
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| niblick | (noun) an iron with considerable loft | Synonyms: nine iron |
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| nudibranch | (noun) any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body | Synonyms: sea slug |
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| olibanum | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, thus |
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| omnibus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, passenger vehicle |
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| (noun) an anthology of articles on a related subject or an anthology of the works of a single author | - |
| ostensibility | (noun) The quality of being professed, supposed rather than demonstrably true or real. | - |
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| patrisib | (noun) one related on the father's side | Synonyms: agnate, patrikin, patrilineal kin, patrilineal sib |
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| pebibit | (noun) a unit of information equal to 1024 tebibits or 2^50 bits | Synonyms: Pibit |
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| pebibyte | (noun) a unit of information equal to 1024 tebibytes or 2^50 bytes | Synonyms: PB, petabyte, PiB |
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| perceptibility | (noun) the property of being perceptible by the mind or the senses | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| permissibility | (noun) admissibility as a consequence of being permitted | - |
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| pibgorn | (noun) an ancient (now obsolete) single-reed woodwind; usually made of bone | Synonyms: hornpipe, stockhorn |
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| pibroch | (noun) martial music with variations; to be played by bagpipes | - |
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| plausibility | (noun) apparent validity | Synonyms: plausibleness |
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| plausibleness | (noun) apparent validity | Synonyms: plausibility |
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| possibility | (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | Synonyms: hypothesis, theory |
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| (noun) a possible alternative | Synonyms: opening, possible action |
| (noun) a future prospect or potential | - |
| (noun) capability of existing or happening or being true | Synonyms: possibleness |
| possible | (noun) something that can be done | - |
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| (noun) an applicant who might be suitable | - |
| possibleness | (noun) capability of existing or happening or being true | Synonyms: possibility |
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| prohibition | (noun) the action of prohibiting or inhibiting or forbidding (or an instance thereof) | Synonyms: forbiddance, inhibition |
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| (noun) a decree that prohibits something | Synonyms: ban, proscription |
| (noun) refusal to approve or assent to | - |
| (noun) a law forbidding the sale of alcoholic beverages | - |
| (noun) the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment | Synonyms: prohibition era |
| prohibitionist | (noun) a reformer who opposes the use of intoxicating beverages | Synonyms: dry |
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| qibla | (noun) the direction of the Kaaba toward which Muslims turn for their daily prayers | - |
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| quibble | (noun) an evasion of the point of an argument by raising irrelevant distinctions or objections | Synonyms: cavil, quiddity |
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| quibbler | (noun) a disputant who quibbles; someone who raises annoying petty objections | Synonyms: caviler, caviller, pettifogger |
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| quodlibet | (noun) an issue that is presented for formal disputation | - |
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| redistribution | (noun) distributing again | - |
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| reprehensibility | (noun) being reprehensible; worthy of and deserving reprehension or reproof | - |
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| reproducibility | (noun) the quality of being reproducible | Synonyms: duplicability |
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| responsibility | (noun) the social force that binds you to the courses of action demanded by that force | Synonyms: duty, obligation |
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| (noun) a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct | Synonyms: responsibleness |
| (noun) the proper sphere or extent of your activities | Synonyms: province |
| responsibleness | (noun) a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct | Synonyms: responsibility |
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| retribution | (noun) the act of correcting for your wrongdoing | - |
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| (noun) the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life | Synonyms: payback, vengeance |
| (noun) a justly deserved penalty | Synonyms: requital |
| reversibility | (noun) the quality of being reversible in either direction | - |
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| reversible | (noun) a garment (especially a coat) that can be worn inside out (with either side of the cloth showing) | - |
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| rib | (noun) support resembling the rib of an animal | - |
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| (noun) a projecting molding on the underside of a vault or ceiling; may be ornamental or structural | - |
| (noun) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) | Synonyms: costa |
| (noun) a riblike supporting or strengthening part of an animal or plant | - |
| (noun) a teasing remark | - |
| (noun) cut of meat including one or more ribs | - |
| ribald | (noun) a ribald person; someone who uses vulgar and offensive language | - |
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| ribaldry | (noun) behavior or language bordering on indelicacy | Synonyms: gaminess, raciness, spiciness |
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| (noun) ribald humor | - |
| riband | (noun) a ribbon used as a decoration | Synonyms: ribband |
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| ribavirin | (noun) an inhaled antiviral agent (trade name Virazole) that may be used to treat serious virus infections | Synonyms: Virazole |
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| ribband | (noun) a ribbon used as a decoration | Synonyms: riband |
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| ribbing | (noun) the act of harassing someone playfully or maliciously (especially by ridicule); provoking someone with persistent annoyances | Synonyms: tantalization, tease, teasing |
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| (noun) a framework of ribs | - |
| ribbon | (noun) notion consisting of a narrow strip of fine material used for trimming | - |
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| (noun) a long strip of inked material for making characters on paper with a typewriter | Synonyms: typewriter ribbon |
| (noun) an award for winning a championship or commemorating some other event | Synonyms: decoration, laurel wreath, medal, medallion, palm |
| (noun) any long object resembling a thin line | Synonyms: thread |
| ribbonfish | (noun) marine fish having a long compressed ribbonlike body | - |
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| (noun) thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin | Synonyms: king of the herring, oarfish, Regalecus glesne |
| ribbonwood | (noun) small tree or shrub of New Zealand having a profusion of axillary clusters of honey-scented paper-white flowers and whose bark is used for cordage | Synonyms: Hoheria populnea, houhere, lacebark |
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| (noun) deciduous New Zealand tree whose inner bark yields a strong fiber that resembles flax and is called New Zealand cotton | Synonyms: Plagianthus betulinus, Plagianthus regius, ribbon tree |
| ribgrass | (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: buckthorn, English plantain, narrow-leaved plantain, Plantago lanceolata, ribwort, ripple-grass |
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| ribier | (noun) dark reddish-purple table grape of California | - |
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| riboflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, lactoflavin, ovoflavin, vitamin B2, vitamin G |
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| ribonuclease | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonucleinase, RNase |
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| ribonucleinase | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonuclease, RNase |
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| ribose | (noun) a pentose sugar important as a component of ribonucleic acid | - |
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| ribosome | (noun) an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell | - |
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| ribwort | (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: buckthorn, English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ripple-grass |
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| risibility | (noun) a disposition to laugh | - |
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| rofecoxib | (noun) a Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tract; voluntarily withdrawn from the market in 2004 | Synonyms: Vioxx |
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| rooibos | (noun) South African shrub having flat acuminate leaves and yellow flowers; leaves are aromatic when dried and used to make an herbal tea | Synonyms: Aspalathus cedcarbergensis, Aspalathus linearis |
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| sahib | (noun) formerly a term of respect for important white Europeans in colonial India; used after the name | - |
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| scribble | (noun) an aimless drawing | Synonyms: doodle, scrabble |
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| (noun) poor handwriting | Synonyms: cacography, scratch, scrawl |
| scribbler | (noun) a writer whose handwriting is careless and hard to read | Synonyms: scrawler |
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| (noun) informal terms for journalists | Synonyms: penman, scribe |
| scribe | (noun) a sharp-pointed awl for marking wood or metal to be cut | Synonyms: scratch awl, scriber |
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| (noun) informal terms for journalists | Synonyms: penman, scribbler |
| (noun) someone employed to make written copies of documents and manuscripts | Synonyms: copyist, scrivener |
| scriber | (noun) a sharp-pointed awl for marking wood or metal to be cut | Synonyms: scratch awl, scribe |
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| semibreve | (noun) a musical note having the longest time value (equal to four beats in common time) | Synonyms: whole note |
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| sensibility | (noun) mental responsiveness and awareness | Synonyms: aesthesia, esthesia |
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| (noun) (physiology) responsiveness to external stimuli; the faculty of sensation | Synonyms: sensitiveness, sensitivity |
| (noun) refined sensitivity to pleasurable or painful impressions | - |
| sensibleness | (noun) the quality of showing good sense or practical judgment | - |
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| shibah | (noun) (Judaism) a period of seven days of mourning after the death of close relative | Synonyms: shiva, shivah |
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| shibboleth | (noun) a manner of speaking that is distinctive of a particular group of people | - |
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| (noun) a favorite saying of a group, organization or individual | Synonyms: catchword, motto, slogan |
| sib | (noun) one related by blood or origin; especially on sharing an ancestor with another | Synonyms: blood relation, blood relative, cognate |
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| (noun) a person's brother or sister | Synonyms: sibling |
| sibilant | (noun) a consonant characterized by a hissing sound (like s or sh) | Synonyms: sibilant consonant |
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| sibilation | (noun) pronunciation with a sibilant (hissing or whistling) sound | Synonyms: assibilation |
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| (noun) a fricative sound (especially as an expression of disapproval) | Synonyms: fizzle, hiss, hissing, hushing |
| sibling | (noun) a person's brother or sister | Synonyms: sib |
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| sibyl | (noun) (ancient Rome) a woman who was regarded as an oracle or prophet | - |
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| (noun) a woman who tells fortunes | - |
| skibob | (noun) a vehicle resembling a bicycle but having skis instead of wheels; the rider wears short skis for balancing | - |
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| sparerib | (noun) a cut of pork ribs with much of the meat trimmed off | - |
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| spareribs | (noun) cut of pork from the rib section with most of the meat trimmed off | - |
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| (noun) baked or roasted with a spicy sauce | Synonyms: barbecued spareribs |
| squib | (noun) firework consisting of a tube filled with powder (as a broken firecracker) that burns with a fizzing noise | - |
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| stibnite | (noun) a soft grey mineral; the chief ore of antimony | - |
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| submersible | (noun) a warship designed to operate under water | Synonyms: submersible warship |
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| (noun) an apparatus intended for use under water | - |
| subscriber | (noun) someone who contributes (or promises to contribute) a sum of money | Synonyms: contributor |
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| (noun) someone who contracts to receive and pay for a service or a certain number of issues of a publication | Synonyms: reader |
| (noun) someone who expresses strong approval | Synonyms: endorser, indorser, ratifier |