| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| infuriation | (noun) a feeling of intense anger and impatience | Synonyms: enragement |
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| infusion | (noun) (medicine) the passive introduction of a substance (a fluid or drug or electrolyte) into a vein or between tissues (as by gravitational force) | - |
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| (noun) the act of infusing or introducing a certain modifying element or quality | - |
| (noun) the process of extracting certain active properties (as a drug from a plant) by steeping or soaking (usually in water) | - |
| (noun) a solution obtained by steeping or soaking a substance (usually in water) | Synonyms: extract |
| infusorian | (noun) any member of the subclass Infusoria | - |
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