| caliph | (noun) the civil and religious leader of a Muslim state considered to be a representative of Allah on earth | Synonyms: calif, kalif, kaliph, khalif, khalifah |
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| caliphate | (noun) the office of a caliph | - |
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| (noun) the territorial jurisdiction of a caliph | - |
| calligrapher | (noun) someone skilled in penmanship | Synonyms: calligraphist |
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| calligraphist | (noun) someone skilled in penmanship | Synonyms: calligrapher |
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| calligraphy | (noun) beautiful handwriting | Synonyms: chirography, penmanship |
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| camphor | (noun) a resin obtained from the camphor tree; used in making celluloid and liniment | - |
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| camphorweed | (noun) aromatic plant of western United States | Synonyms: Trichostema lanceolatum, turpentine camphor weed, vinegarweed |
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| cardiograph | (noun) medical instrument that records electric currents associated with contractions of the heart | Synonyms: electrocardiograph |
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| (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: ballistocardiograph |
| cardiography | (noun) diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram) | Synonyms: electrocardiography |
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| carpophore | (noun) a slender stalk that furnishes an axis for a carpel | - |
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| cartographer | (noun) a person who makes maps | Synonyms: map maker |
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| cartography | (noun) the making of maps and charts | Synonyms: mapmaking |
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| cataphasia | (noun) a speech disorder in which the same word is repeated several times in succession | - |
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| cataphatism | (noun) the religious belief that God has given enough clues to be known to humans positively and affirmatively (e.g., God created Adam `in his own image') | - |
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| cataphoresis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: dielectrolysis, electrophoresis, ionophoresis |
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| cataphract | (noun) armor that protects the wearer's whole body | Synonyms: body armor, body armour, coat of mail, suit of armor, suit of armour |
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| cataphyll | (noun) a reduced or scarcely developed leaf at the start of a plant's life (i.e., cotyledons) or in the early stages of leaf development | - |
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| catastrophe | (noun) an event resulting in great loss and misfortune | Synonyms: calamity, cataclysm, disaster, tragedy |
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| (noun) a sudden violent change in the earth's surface | Synonyms: cataclysm |
| (noun) a state of extreme (usually irremediable) ruin and misfortune | Synonyms: disaster |
| catchphrase | (noun) a phrase that has become a catchword | Synonyms: catch phrase |
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| cellophane | (noun) a transparent paperlike product that is impervious to moisture and used to wrap candy or cigarettes etc. | - |
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| cellphone | (noun) a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver | Synonyms: cell, cellular phone, cellular telephone, mobile phone |
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| cenotaph | (noun) a monument built to honor people whose remains are interred elsewhere or whose remains cannot be recovered | Synonyms: empty tomb |
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| cephalalgia | (noun) pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs | Synonyms: head ache, headache |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| cephalexin | (noun) a cephalosporin antibiotic (trade names Keflex and Keflin and Keftab) commonly prescribed for mild to moderately severe infections of the skin or ears or throat or lungs or urinary tract | Synonyms: Keflex, Keflin, Keftab |
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| cephalhematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalohematoma |
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| cephalitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: encephalitis, phrenitis |
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| cephalochordate | (noun) fish-like animals having a notochord rather than a true spinal column | - |
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| cephaloglycin | (noun) antibiotic related to cephalosporin but no longer in common use | Synonyms: Kafocin |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| cephalometry | (noun) measurement of human heads | - |
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| cephalopod | (noun) marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles | Synonyms: cephalopod mollusk |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| cephalosporin | (noun) one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin); addition of side chains has produced semisynthetic antibiotics with greater antibacterial activity | Synonyms: Mefoxin |
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| cephalothin | (noun) a semisynthetic analogue of cephalosporin | - |
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| cerography | (noun) the art of engraving on a waxed plate on which a printing surface is created by electrotyping. | - |
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| chemoautotroph | (noun) An organism that depends on chemicals for its energy and principally on carbon dioxide for its carbon. | Synonyms: chemotrophic autotroph |
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| chirography | (noun) beautiful handwriting | Synonyms: calligraphy, penmanship |
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| chlamyphore | (noun) very small Argentine armadillo with pale silky hair and pink plates on head and neck | Synonyms: Chlamyphorus truncatus, fairy armadillo, pichiciago, pichiciego |
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| chloramphenicol | (noun) an oral antibiotic (trade name Chloromycetin) used to treat serious infections (especially typhoid fever) | Synonyms: Chloromycetin |
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| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| chlorophyl | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyll |
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| chlorophyll | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyl |
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| chlorophyte | (noun) algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water | Synonyms: green algae |
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| cholangiography | (noun) roentgenographic examination of the bile ducts after a contrast medium has been injected | - |
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| chondrodystrophy | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, achondroplasty, osteosclerosis congenita |
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| chophouse | (noun) a restaurant that specializes in steaks | Synonyms: steakhouse |
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| chordophone | (noun) a stringed instrument of the group including harps, lutes, lyres, and zithers | - |
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| choreographer | (noun) someone who creates new dances | - |
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| choreography | (noun) a show involving artistic dancing | Synonyms: stage dancing |
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| (noun) the representation of dancing by symbols as music is represented by notes | - |
| (noun) a notation used by choreographers | - |
| chromatograph | (noun) equipment that enables a sophisticated separation, e.g. gas chromatographic or liquid chromatographic separation. | - |
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| chromatography | (noun) a process used for separating mixtures by virtue of differences in absorbency | - |
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| chromolithograph | (noun) a print made by chromolithography. | - |
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| chromolithography | (noun) single- or multi-color lithography | - |
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| chromophore | (noun) the chemical group that gives color to a molecule | - |
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| chromosphere | (noun) a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun | - |
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| chronograph | (noun) an accurate timer for recording time | - |
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| ciliophoran | (noun) a protozoan with a microscopic appendage extending from the surface of the cell | Synonyms: ciliate, ciliated protozoan |
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| cinematographer | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cameraman |
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| cinematography | (noun) the act of making a film | Synonyms: filming, motion-picture photography |
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| cipher | (noun) a secret method of writing | Synonyms: cryptograph, cypher, secret code |
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| (noun) a message written in a secret code | Synonyms: cypher |
| (noun) a person of no influence | Synonyms: cypher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cypher, nought, zero |
| cladophyll | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, phylloclad, phylloclade |
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| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| clinocephalism | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephaly |
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| clinocephaly | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephalism |
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| clomiphene | (noun) a fertility drug (trade name Clomid) that is used to stimulate ovulation and that has been associated with multiple births | Synonyms: Clomid, clomiphene citrate |
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| coelophysis | (noun) one of the oldest known dinosaurs; late Triassic; cannibalistic | - |
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| coliphage | (noun) a bacteriophage that infects the bacterium Escherichia coli | - |
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| colophon | (noun) a publisher's emblem printed in a book (usually on the title page) | - |
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| colophony | (noun) translucent brittle substance produced from pine oleoresin; used especially in varnishes and inks and on the bows of stringed instruments | - |
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| conidiophore | (noun) a specialized fungal hypha that produces conidia | - |
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| coprophagia | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagy |
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| coprophagy | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagia |
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| corticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, adrenocorticotropin, corticotropin |
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| coryphantha | (noun) a cactus of the genus Coryphantha | - |
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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) | - |
| crotaphion | (noun) the tip of the greater wing of the sphenoid bone | - |
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| cryophobia | (noun) a morbid fear of freezing | - |
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| cryptograph | (noun) a device for deciphering codes and ciphers | - |
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| (noun) a piece of writing in code or cipher | Synonyms: cryptogram, secret writing |
| (noun) a secret method of writing | Synonyms: cipher, cypher, secret code |
| cryptographer | (noun) decoder skilled in the analysis of codes and cryptograms | Synonyms: cryptanalyst, cryptologist |
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| cryptography | (noun) act of writing in code or cipher | Synonyms: coding, secret writing, steganography |
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| (noun) the science of analyzing and deciphering codes and ciphers and cryptograms | Synonyms: cryptanalysis, cryptanalytics, cryptology |
| cryptophyte | (noun) common in fresh and salt water appearing along the shore as algal blooms | Synonyms: cryptomonad |
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| crystallographer | (noun) a specialist in crystallography | - |
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| crystallography | (noun) the branch of science that studies the formation and structure of crystals | - |
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| ctenophore | (noun) biradially symmetrical hermaphroditic solitary marine animals resembling jellyfishes having for locomotion eight rows of cilia arranged like teeth in a comb | Synonyms: comb jelly |
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| cyberphobia | (noun) irrational fear of computers or technology | - |
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| cymograph | (noun) scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure) | Synonyms: kymograph |
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| cynophobia | (noun) a morbid fear of dogs | - |
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| cypher | (noun) a secret method of writing | Synonyms: cipher, cryptograph, secret code |
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| (noun) a message written in a secret code | Synonyms: cipher |
| (noun) a person of no influence | Synonyms: cipher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, nought, zero |
| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytophotometry | (noun) the study of chemical compounds inside a cell by means of a cytophotometer | - |
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| daphne | (noun) any of several ornamental shrubs with shiny mostly evergreen leaves and clusters of small bell-shaped flowers | - |
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| daphnia | (noun) minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae | Synonyms: water flea |
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| dauphin | (noun) formerly, the eldest son of the King of France and direct heir to the throne | - |
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| decipherer | (noun) a reader capable of reading and interpreting illegible or obscure text | - |
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| (noun) the kind of intellectual who converts messages from a code to plain text | Synonyms: decoder |
| decipherment | (noun) the activity of making clear or converting from code into plain text | Synonyms: decoding, decryption |
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| deipnosophist | (noun) someone skilled at informal chitchat | - |
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