| phlebectomy | (noun) surgical removal or all or part of a vein; sometimes done in cases of severe varicose veins | - |
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| phlebitis | (noun) inflammation of a vein (usually in the legs) | - |
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| phlebogram | (noun) an X ray of a vein injected with a radiopaque contrast medium | Synonyms: venogram |
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| phlebothrombosis | (noun) thrombosis of a vein without prior inflammation of the vein; associated with sluggish blood flow (as in prolonged bedrest or pregnancy or surgery) or with rapid coagulation of the blood | Synonyms: venous thrombosis |
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| phlebotomist | (noun) someone who practices phlebotomy | - |
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| phlebotomus | (noun) a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii | Synonyms: pappataci fever, sandfly fever |
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| phlebotomy | (noun) surgical incision into a vein; used to treat hemochromatosis | Synonyms: venesection |
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| phlegm | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, lethargy, sluggishness |
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| (noun) expectorated matter; saliva mixed with discharges from the respiratory passages; in ancient and medieval physiology it was believed to cause sluggishness | Synonyms: sputum |
| (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, impassivity, indifference, stolidity, unemotionality |
| phlegmatizer | (noun) a material added to an explosive to make it less susceptible to detonation and thus more stable and safer to handle and transport. | - |
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| phloem | (noun) (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes | Synonyms: bast |
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| phlogiston | (noun) a hypothetical substance once believed to be present in all combustible materials and to be released during burning | - |
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| phlogopite | (noun) a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum | - |
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| phlomis | (noun) any of various plants of the genus Phlomis; grown primarily for their dense whorls of lipped flowers and attractive foliage | - |
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| phlox | (noun) any polemoniaceous plant of the genus Phlox; chiefly North American; cultivated for their clusters of flowers | - |
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