| cos | (noun) lettuce with long dark-green leaves in a loosely packed elongated head | Synonyms: cos lettuce, romaine, romaine lettuce |
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| (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cosine |
| coscoroba | (noun) large white South American bird intermediate in some respects between ducks and swans | - |
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| cosec | (noun) ratio of the hypotenuse to the opposite side of a right-angled triangle | Synonyms: cosecant |
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| cosecant | (noun) ratio of the hypotenuse to the opposite side of a right-angled triangle | Synonyms: cosec |
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| coseismal | (adjective) being where earthquake waves arrive simultaneously | Synonyms: coseismic |
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| coseismic | (adjective) being where earthquake waves arrive simultaneously | Synonyms: coseismal |
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| cosh | (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: blackjack, sap |
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| (verb) hit with a cosh, usually on the head | - |
| cosher | (adjective) conforming to Jewish dietary laws | Synonyms: kosher |
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| cosign | (verb) sign and endorse (another person's signature), as for a loan | Synonyms: co-sign |
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| (verb) sign jointly | Synonyms: co-sign |
| cosignatory | (adjective) signing jointly with others | - |
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| (noun) one of two or more signers of the same document (as a treaty or declaration) | Synonyms: cosigner |
| cosigner | (noun) one of two or more signers of the same document (as a treaty or declaration) | Synonyms: cosignatory |
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| (noun) a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) | - |
| cosily | (adverb) in a cozy manner | Synonyms: cozily |
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| cosine | (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cos |
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| cosiness | (noun) a state of warm snug comfort | Synonyms: coziness, snugness |
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| cosmea | (noun) any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals | Synonyms: cosmos |
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| cosmetic | (adjective) serving an aesthetic purpose in beautifying the body | Synonyms: enhancive |
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| (adjective) serving an esthetic rather than a useful purpose | Synonyms: decorative, ornamental |
| (noun) a toiletry designed to beautify the body | - |
| cosmetically | (adverb) for cosmetic purposes to improve appearance | - |
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| cosmetician | (noun) someone who sells or applies cosmetics | - |
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| (noun) someone who works in a beauty parlor | Synonyms: beautician |
| cosmetologist | (noun) an expert in the use of cosmetics | - |
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| cosmetology | (noun) the practice of beautifying the face and hair and skin | - |
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| cosmic | (adjective) of or from or pertaining to or characteristic of the cosmos or universe | - |
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| (adjective) inconceivably extended in space or time | - |
| cosmid | (noun) (genetics) a large vector that is made from a bacteriophage and used to clone genes or gene fragments | - |
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| cosmogenic | (adjective) pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe | Synonyms: cosmogonic, cosmogonical, cosmologic, cosmological |
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| cosmogeny | (noun) the branch of astrophysics that studies the origin and evolution and structure of the universe | Synonyms: cosmogony, cosmology |
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| cosmogonic | (adjective) pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe | Synonyms: cosmogenic, cosmogonical, cosmologic, cosmological |
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| cosmogonical | (adjective) pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe | Synonyms: cosmogenic, cosmogonic, cosmologic, cosmological |
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| cosmogony | (noun) the branch of astrophysics that studies the origin and evolution and structure of the universe | Synonyms: cosmogeny, cosmology |
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| cosmographer | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographist |
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| cosmographist | (noun) a scientist knowledgeable about cosmography | Synonyms: cosmographer |
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| cosmography | (noun) a representation of the earth or the heavens | - |
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| (noun) the science that maps the general features of the universe; describes both heaven and earth (but without encroaching on geography or astronomy) | - |
| cosmolatry | (noun) the worship of the cosmos | - |
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| cosmologic | (adjective) pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe | Synonyms: cosmogenic, cosmogonic, cosmogonical, cosmological |
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| (adjective) pertaining to the branch of philosophy dealing with the elements and laws and especially the characteristics of the universe such as space and time and causality | Synonyms: cosmological |
| cosmological | (adjective) pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe | Synonyms: cosmogenic, cosmogonic, cosmogonical, cosmologic |
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| (adjective) pertaining to the branch of philosophy dealing with the elements and laws and especially the characteristics of the universe such as space and time and causality | Synonyms: cosmologic |
| cosmologist | (noun) an astronomer who studies the evolution and space-time relations of the universe | - |
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| cosmology | (noun) the branch of astrophysics that studies the origin and evolution and structure of the universe | Synonyms: cosmogeny, cosmogony |
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| (noun) the metaphysical study of the origin and nature of the universe | - |
| cosmonaut | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, spaceman |
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| cosmopolitan | (adjective) growing or occurring in many parts of the world | Synonyms: widely distributed |
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| (adjective) composed of people from or at home in many parts of the world; especially not provincial in attitudes or interests | - |
| (adjective) of worldwide scope or applicability | Synonyms: ecumenical, general, oecumenical, universal, world-wide, worldwide |
| (noun) a sophisticated person who has travelled in many countries | Synonyms: cosmopolite |
| cosmopolitanity | (noun) a state or quality of being cosmopolitan | - |
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| cosmopolite | (noun) a sophisticated person who has travelled in many countries | Synonyms: cosmopolitan |
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| cosmos | (noun) everything that exists anywhere | Synonyms: creation, existence, macrocosm, universe, world |
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| (noun) any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals | Synonyms: cosmea |
| cosmotron | (noun) a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons | - |
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| cosplay | (verb) wear a costume to resemble a character from some media especially anime | - |
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| cosplayer | (noun) Someone who wears a costume from a comic book or similar media | - |
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| cosponsor | (verb) sponsor together with another sponsor | - |
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| coss | (noun) (in India) a unit of length having different values in different localities | Synonyms: kos |
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| cosset | (verb) treat with excessive indulgence | Synonyms: baby, cocker, coddle, featherbed, indulge, mollycoddle, pamper, spoil |
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| cost | (noun) the property of having material worth (often indicated by the amount of money something would bring if sold) | Synonyms: monetary value, price |
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| (noun) value measured by what must be given or done or undergone to obtain something | Synonyms: price, toll |
| (noun) the total spent for goods or services including money and time and labor | - |
| (verb) be priced at | Synonyms: be |
| (verb) require to lose, suffer, or sacrifice | - |
| costa | (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: rib |
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| (noun) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing) | - |
| costal | (adjective) of or relating to or near a rib | - |
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| costalgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: pleuralgia, pleurodynia |
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| costate | (adjective) having ribs | - |
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| (adjective) (of the surface) having a rough, riblike texture | Synonyms: ribbed |
| costermonger | (noun) a hawker of fruit and vegetables from a barrow | Synonyms: barrow-boy, barrow-man |
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| costia | (noun) a flagellate that is the cause of the frequently fatal fish disease costiasis | Synonyms: Costia necatrix |
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| costiasis | (noun) a fatal disease of freshwater fish caused by a flagellated protozoan invading the skin | - |
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| costing | (noun) cost accounting | - |
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| costive | (adjective) retarding evacuation of feces; binding; constipating | - |
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| costless | (adjective) costing nothing | Synonyms: complimentary, free, gratis, gratuitous |
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| costliness | (noun) the quality possessed by something with a great price or value | Synonyms: dearness, preciousness |
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| costly | (adjective) having a high price | Synonyms: dear, high-priced, pricey, pricy |
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| (adjective) entailing great loss or sacrifice | Synonyms: dearly-won |
| costmary | (noun) leaves used sparingly (because of bitter overtones) in sauces and soups and stuffings | - |
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| (noun) tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum | Synonyms: alecost, balsam herb, bible leaf, Chrysanthemum balsamita, mint geranium, Tanacetum balsamita |
| costochondritis | (noun) inflammation at the junction of a rib and its cartilage | - |
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| costs | (noun) pecuniary reimbursement to the winning party for the expenses of litigation | - |
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| costume | (noun) the attire worn in a play or at a fancy dress ball | - |
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| (noun) the attire characteristic of a country or a time or a social class | - |
| (noun) unusual or period attire not characteristic of or appropriate to the time and place | - |
| (noun) the prevalent fashion of dress (including accessories and hair style as well as garments) | - |
| (verb) dress in a costume | Synonyms: dress up |
| (verb) furnish with costumes; as for a film or play | - |
| costumed | (adjective) dressed in clothing characteristic of a period, country, or class | - |
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| costumer | (noun) someone who designs or supplies costumes (as for a play or masquerade) | Synonyms: costume designer, costumier |
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| costumier | (noun) someone who designs or supplies costumes (as for a play or masquerade) | Synonyms: costume designer, costumer |
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| costusroot | (noun) annual herb of the eastern Himalayas (Kashmir) having purple florets and a fragrant root that yields a volatile oil used in perfumery and for preserving furs | Synonyms: Saussurea costus, Saussurea lappa |
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| cosy | (adjective) enjoying or affording comforting warmth and shelter especially in a small space | Synonyms: cozy, snug |
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| (noun) a padded cloth covering to keep a teapot warm | Synonyms: cozy, tea cosy, tea cozy |
| (adjective) suggesting connivance | Synonyms: cozy |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cozy, informal, intimate |