| amygdalin | (noun) a bitter cyanogenic glucoside extracted from the seeds of apricots and plums and bitter almonds | - |
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| digitalin | (noun) a powerful cardiac stimulant obtained from foxglove | Synonyms: digitalis, digitalis glycoside |
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| enkephalin | (noun) an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere | - |
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| formalin | (noun) a 10% solution of formaldehyde in water; used as a disinfectant or to preserve biological specimens | Synonyms: formol |
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| hyalin | (noun) a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions | Synonyms: hyaline |
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| keratohyalin | (noun) hyaline in the large granules of the stratum granulosum | - |
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| ptyalin | (noun) an amylase secreted in saliva | - |
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