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chlorophyll, chlorophyl

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(klōr′ŏ-fil″) [chloro- + Gr. phyllon, leaf] The green pigment in plants that accomplishes photosynthesis. In this process, carbon dioxide (CO2) and water (H2O) are combined to form glucose and oxygen according to the following equation: 6 CO2 + 6 H2O + light → C6H12O6 + 6 O2. The primary energy source for our planet is the sunlight absorbed by chlorophyll. Four forms of chlorophyll (a, b, c, and d) occur in nature.

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chloropia, chloropsia

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(klō-rō′pē-ă, klō-rŏp′sē-ă) [″ + opsis, vision] A sign of digitalis toxicity in which viewed objects appear green.

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Chloropidae

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(klor-op′ĭ-dē″) [Gr. chlōros, green, yellow, pale green + Gr. ōps, eye + -idae] A family of small flies with the genera Hippelates (eye gnats, eye flies) and Siphunculina (tropical eye flies). They are attracted to eyes and open sores and spread conjunctivitis and yaws.

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chloroplast, chloroplastid

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(klōrŏ-plast″, klōr″ŏ-plas′tĭd) [chloro- + -plast] A small green cell organelle found in the leaves and some stems of plants. Chloroplasts are the sites of photosynthesis. They possess a stroma and contain four pigments: chlorophyll a, chlorophyll b, carotene, and xanthophyll.

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chloroquine hydrochloride

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(klō′rō-kwĭn) A white crystalline powder used to treat both malaria and amebic dysentery. SEE: malaria.

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chlorosis

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(klŏ-rō′sĭs) [chloro- + -sis] An old term for iron-deficiency anemia. SYN: green sickness. chlorotic (-rot′ik), adj.

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chlorpheniramine maleate

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(klor″fĕn-ĭr′ă-mēn) An antihistamine that may be used orally or by injection. It is available under several trade names, including Chlor-Trimeton and Teldrin.

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chlorpromazine

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(klawr-prō′mă-zēn) A tranquilizing agent used primarily in its hydrochloride form to treat schizophrenia. Its side effects may include sedation, slurred speech, and tardive dyskinesia.

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ChM

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chirurgiae magister, Master of Surgery.

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CHN

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Chinese herb nephropathy.

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choana

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(kō″ă-nă) pl. choanae [Gr. choanē, funnel] A funnel-shaped opening, esp. of the posterior nares (either of the two communicating passageways between the nasal fossae and the pharynx). choanal (-năl), adj.

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choke

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(chōk) [ME. choken] To prevent respiration by compressing or obstructing the larynx or trachea.

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choked disk

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Papilledema.

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chokes

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(chōkz) Respiratory symptoms such as substernal distress, paroxysmal cough, tachypnea, or asphyxia. These may occur in decompression illness, esp. in cases of aeroembolism resulting from exposure to pressure lower than atmospheric.

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choking

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(chōk′ĭng) [ME. choken, to suffocate] Upper airway obstruction caused, for ...

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