| 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 |
| catastrophic | (adjective) extremely harmful; bringing physical or financial ruin | Synonyms: ruinous |
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| catastrophically | (adverb) with unfortunate consequences | - |
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| centroid | (noun) the center of mass of an object of uniform density | - |
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| centroidal | (adjective) of or relating to (especially passing through) a centroid | - |
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| centromere | (noun) a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape | Synonyms: kinetochore |
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| centromeric | (adjective) pertaining to the dense specialized portion of a chromosome to which the spindle attaches during mitosis | - |
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| centrosome | (noun) small region of cytoplasm adjacent to the nucleus; contains the centrioles and serves to organize the microtubules | Synonyms: central body |
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| centrosomic | (adjective) of or relating to a centrosome | - |
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| centrosymmetric | (adjective) having a symmetrical arrangement of radiating parts about a central point | Synonyms: radially symmetrical |
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| chatroom | (noun) a site on the internet where a number of users can communicate in real time (typically one dedicated to a particular topic) | Synonyms: chat room |
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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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| 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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| cilantro | (noun) parsley-like herb used as seasoning or garnish | Synonyms: Chinese parsley, coriander |
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| (noun) Old World herb with aromatic leaves and seed resembling parsley | Synonyms: Chinese parsley, coriander, coriander plant, Coriandrum sativum |
| cistron | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: factor, gene |
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| citron | (noun) large lemonlike fruit with thick aromatic rind; usually preserved | - |
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| (noun) thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind | Synonyms: citron tree, Citrus medica |
| citronwood | (noun) wood of a citron tree | - |
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| (noun) durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain) | Synonyms: sandarac |
| citrous | (adjective) of or relating to or producing fruit of the plants of the genus Citrus | - |
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| (adjective) of or relating to plants of the genus Citrus | - |
| 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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| claustrophobic | (adjective) suffering from claustrophobia; abnormally afraid of closed-in places | - |
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| (adjective) uncomfortably closed or hemmed in | - |
| coatroom | (noun) a room where coats and other articles can be left temporarily | Synonyms: cloakroom |
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| comptroller | (noun) someone who maintains and audits business accounts | Synonyms: accountant, controller |
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| comptrollership | (noun) the position of comptroller | - |
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| control | (noun) the activity of managing or exerting control over something | - |
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| (noun) (physiology) regulation or maintenance of a function or action or reflex etc | - |
| (noun) a mechanism that controls the operation of a machine | Synonyms: controller |
| (noun) power to direct or determine | - |
| (noun) discipline in personal and social activities | Synonyms: restraint |
| (noun) great skillfulness and knowledge of some subject or activity | Synonyms: command, mastery |
| (noun) a standard against which other conditions can be compared in a scientific experiment | Synonyms: control condition |
| (noun) the economic policy of controlling or limiting or curbing prices or wages etc. | - |
| (noun) a spiritual agency that is assumed to assist the medium during a seance | - |
| (noun) a relation of constraint of one entity (thing or person or group) by another | - |
| (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, ascendency, dominance |
| (verb) have a firm understanding or knowledge of; be on top of | Synonyms: master |
| (verb) be careful or certain to do something; make certain of something | Synonyms: ascertain, assure, check, ensure, insure, see, see to it |
| (verb) verify by using a duplicate register for comparison | - |
| (verb) handle and cause to function | Synonyms: operate |
| (verb) maintain influence over (others or oneself) skillfully, usually to one's advantage | Synonyms: keep in line, manipulate |
| (verb) exercise authoritative control or power over | Synonyms: command |
| (verb) lessen the intensity of; temper; hold in restraint; hold or keep within limits | Synonyms: check, contain, curb, hold, hold in, moderate |
| (verb) check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard | Synonyms: verify |
| (verb) place under restrictions; limit access to by law | Synonyms: restrict |
| controllable | (adjective) capable of being controlled | Synonyms: governable |
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| controlled | (adjective) restrained or managed or kept within certain bounds | - |
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| controller | (noun) a mechanism that controls the operation of a machine | Synonyms: control |
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| (noun) someone who maintains and audits business accounts | Synonyms: accountant, comptroller |
| (noun) a person who directs and restrains | Synonyms: restrainer |
| controllership | (noun) the position of controller | - |
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| controlling | (adjective) able to control or determine policy | - |
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| controversial | (adjective) marked by or capable of arousing controversy | - |
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| controversialist | (noun) a person who disputes; who is good at or enjoys controversy | Synonyms: disputant, eristic |
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| controversially | (adverb) involving controversy | Synonyms: polemically |
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| controversy | (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: arguing, argument, contention, contestation, disceptation, disputation, tilt |
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| controvert | (verb) prove to be false or incorrect | Synonyms: rebut, refute |
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| (verb) be resistant to | Synonyms: contradict, oppose |
| 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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| corticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin |
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| cosmotron | (noun) a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons | - |
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| courtroom | (noun) a room in which a law court sits | Synonyms: court |
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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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| decontrol | (verb) relax or remove controls of | - |
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| destroy | (verb) defeat soundly and humiliatingly | Synonyms: demolish |
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| (verb) destroy completely; damage irreparably | Synonyms: ruin |
| (verb) put (an animal) to death | Synonyms: put down |
| (verb) do away with, cause the destruction or undoing of | Synonyms: destruct |
| destroyable | (adjective) capable of being destroyed | - |
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| destroyed | (adjective) spoiled or ruined or demolished | - |
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| (adjective) destroyed physically or morally | Synonyms: ruined |
| destroyer | (noun) a small fast lightly armored but heavily armed warship | Synonyms: guided missile destroyer |
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| (noun) a person who destroys or ruins or lays waste to | Synonyms: ruiner, undoer, uprooter, waster |
| dextrocardia | (noun) abnormal condition where the heart is located toward the right side of the chest | - |
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| dextroglucose | (noun) an isomer of glucose that is found in honey and sweet fruits | Synonyms: dextrose, grape sugar |
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| dextrorotary | (adjective) rotating to the right | Synonyms: dextrorotatory, right-handed |
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| dextrorotation | (noun) rotation to the right | Synonyms: clockwise rotation |
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| dextrorotatory | (adjective) rotating to the right | Synonyms: dextrorotary, right-handed |
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| dextrorsal | (adjective) spiraling upward from left to right | Synonyms: dextrorse |
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| dextrorse | (adjective) spiraling upward from left to right | Synonyms: dextrorsal |
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| dextrose | (noun) an isomer of glucose that is found in honey and sweet fruits | Synonyms: dextroglucose, grape sugar |
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| dextrous | (adjective) skillful in physical movements; especially of the hands | Synonyms: deft, dexterous |
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| dextrously | (adverb) with dexterity; in a dexterous manner | Synonyms: deftly, dexterously |
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| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| dielectrolysis | (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: cataphoresis, electrophoresis, ionophoresis |
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| diestrous | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrual, dioestrous, dioestrual |
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| diethylstilbestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilboestrol, stilbestrol, stilboestrol |
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| diethylstilboestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, stilbestrol, stilboestrol |
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| dimetrodon | (noun) carnivorous dinosaur of the Permian in North America having a crest or dorsal sail | - |
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| dioestrous | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrous, diestrual, dioestrual |
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| disastrous | (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, fatal, fateful |
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| disastrously | (adverb) in a disastrous manner | - |
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| dogtrot | (noun) a steady trot like that of a dog | - |
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| downstroke | (noun) a stroke normally made in a downward direction | - |
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| downtrodden | (adjective) abused or oppressed by people in power | - |
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| dystrophy | (noun) any degenerative disorder resulting from inadequate or faulty nutrition | - |
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| (noun) any of several hereditary diseases of the muscular system characterized by weakness and wasting of skeletal muscles | Synonyms: muscular dystrophy |
| ectrodactyly | (noun) congenital abnormality involving the absence of some fingers or toes | - |
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| electrocardiogram | (noun) a graphical recording of the cardiac cycle produced by an electrocardiograph | Synonyms: cardiogram, ECG, EKG |
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| electrocardiograph | (noun) medical instrument that records electric currents associated with contractions of the heart | Synonyms: cardiograph |
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| electrocardiographic | (adjective) of or relating to an electrocardiograph | - |
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| electrocardiography | (noun) diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram) | Synonyms: cardiography |
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| electrocautery | (noun) application of a needle heated by an electric current to destroy tissue (as to remove warts) | - |
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| electrochemical | (adjective) of or involving electrochemistry | - |
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| electrochemistry | (noun) branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions | - |
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| electrocute | (verb) kill by electrocution, as in the electric chair | Synonyms: fry |
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| (verb) kill by electric shock | - |
| electrocution | (noun) killing by electric shock | - |
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| (noun) execution by electricity | Synonyms: burning |
| electrocutioner | (noun) an executioner who uses electricity to kill the condemned person | - |
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| electrode | (noun) a conductor used to make electrical contact with some part of a circuit | - |
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| electrodeposition | (noun) the deposition of a substance on an electrode by the action of electricity (especially by electrolysis) | - |
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| electrodynamometer | (noun) measuring instrument that uses the interaction of the magnetic fields of two coils to measure current or voltage or power | - |
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| electroencephalogram | (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, encephalogram |
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| electroencephalograph | (noun) medical instrument that records electric currents generated by the brain | - |
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| electroencephalographic | (adjective) of or relating to an electroencephalograph | - |
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| electrograph | (noun) electrical device used for etching by electrolytic means | - |
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| (noun) an apparatus for the electrical transmission of pictures | - |
| electrolocation | (noun) The use of electroreception to locate surrounding objects. | - |
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| electrologist | (noun) someone skilled in the use of electricity to remove moles or warts or hair roots | - |
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| electrolysis | (noun) removing superfluous or unwanted hair by passing an electric current through the hair root | - |
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| (noun) (chemistry) a chemical decomposition reaction produced by passing an electric current through a solution containing ions | - |
| electrolyte | (noun) a solution that conducts electricity | - |
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| electrolytic | (adjective) of or relating to or containing an electrolyte | - |
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| (adjective) of or concerned with or produced by electrolysis | - |
| (noun) a fixed capacitor consisting of two electrodes separated by an electrolyte | Synonyms: electrolytic capacitor, electrolytic condenser |
| electromagnet | (noun) a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet | - |
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| electromagnetic | (adjective) pertaining to or exhibiting magnetism produced by electric charge in motion | - |
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| electromagnetics | (noun) the branch of physics concerned with electromagnetic phenomena | Synonyms: electromagnetism |
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| electromagnetism | (noun) the branch of physics concerned with electromagnetic phenomena | Synonyms: electromagnetics |
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| (noun) magnetism produced by an electric current | - |
| electromechanical | (adjective) of or relating to or involving an electrically operated mechanical device | - |
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| electrometer | (noun) meter to measure electrostatic voltage differences; draws no current from the source | - |
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| electromotive | (adjective) concerned with or producing electric current | - |
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| electromyogram | (noun) a graphical record of electric currents associated with muscle contractions | Synonyms: EMG |
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| electromyograph | (noun) a medical instrument that records the electrical waves associated with the activity of skeletal muscles | - |
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