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chlorophyll, chlorophyl

(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.

chloropia, chloropsia

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

Chloropidae

(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.

chloroplast, chloroplastid

(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.

chloroquine hydrochloride

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

chlorosis

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

chlorpheniramine maleate

(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.

chlorpromazine

(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.

ChM

chirurgiae magister, Master of Surgery.

CHN

Chinese herb nephropathy.

choana

(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.

choke

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

choked disk

Papilledema.

chokes

(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.

choking

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

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