| aril | (noun) fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelops the seed | - |
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| captopril | (noun) a drug (trade name Capoten) that blocks the formation of angiotensin in the kidneys resulting in vasodilation; used in the treatment of hypertension and congestive heart failure | Synonyms: Capoten |
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| courbaril | (noun) West Indian locust tree having pinnate leaves and panicles of large white or purplish flowers; yields very hard tough wood | Synonyms: Hymenaea courbaril |
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| enalapril | (noun) an ACE inhibitor (trade name Vasotec) that blocks the formation of angiotensin in the kidney and so results in vasodilation; administered after heart attacks | Synonyms: Vasotec |
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| fibril | (noun) a very slender natural or synthetic fiber | Synonyms: filament, strand |
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| lisinopril | (noun) an ACE inhibiting drug (trade names Prinivil or Zestril) administered as an antihypertensive and after heart attacks | Synonyms: Prinivil, Zestril |
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| mandril | (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: arbor, mandrel, spindle |
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| myofibril | (noun) one of many contractile filaments that make up a striated muscle fiber | Synonyms: myofibrilla, sarcostyle |
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| neurofibril | (noun) Any of the long, thin, microscopic fibrils that run through the body of a neuron and extend into the axon and dendrites, giving the neuron support and shape. | - |
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| nitril | (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: cyanide, nitrile |
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| nombril | (noun) the center point on a shield | - |
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| nostril | (noun) either one of the two external openings to the nasal cavity in the nose | Synonyms: anterior naris |
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| peril | (noun) a venture undertaken without regard to possible loss or injury | Synonyms: danger, risk |
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| (noun) a source of danger; a possibility of incurring loss or misfortune | Synonyms: endangerment, hazard, jeopardy, risk |
| (noun) a state of danger involving risk | Synonyms: riskiness |
| ramipril | (noun) an ACE inhibitor (trade name Altace) used to treat high blood pressure or in some patients who have had a heart attack | Synonyms: Altace |
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| spandril | (noun) an approximately triangular surface area between two adjacent arches and the horizontal plane above them | Synonyms: spandrel |
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| tendril | (noun) slender stem-like structure by which some twining plants attach themselves to an object for support | - |
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| trandolapril | (noun) an ACE inhibiting drug (trade name Mavik) used in some patients after a heart attack or to treat hypertension | Synonyms: Mavik |
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| tumbril | (noun) a farm dumpcart for carrying dung; carts of this type were used to carry prisoners to the guillotine during the French Revolution | Synonyms: tumbrel |
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| zoril | (noun) muishond of northern Africa | Synonyms: Ictonyx frenata |
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