| DEHYDRORETINOL | • dehydroretinol n. (Organic chemistry) A derivative of retinol having an extra double bond; vitamin A2. • DEHYDRORETINOL n. vitamin A2.
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| HYDROCORALLINE | • HYDROCORALLINE n. a member the Hydrozoa, which includes millepores etc. | 
| HYDROGENOLYSIS | • hydrogenolysis n. (Chemistry) the cleavage of a molecule, especially that of a carbon-carbon bond, with the addition of… • HYDROGENOLYSIS n. a chemical reaction in which a compound is decomposed by hydrogen.
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| HYDROLYSATIONS | • hydrolysations n. Plural of hydrolysation. • HYDROLYSATION n. the process of hydrolysing, also HYDROLYZATION.
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| HYDROLYZATIONS | • hydrolyzations n. Plural of hydrolyzation. • HYDROLYZATION n. the process of hydrolyzing, also HYDROLYSATION.
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| HYDROPONICALLY | • hydroponically adv. Using hydroponics. • HYDROPONIC adv. relating to hydroponics, the practice of growing plants in a chemical solution without soil.
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| HYDROXYLATIONS | • hydroxylations n. Plural of hydroxylation. • HYDROXYLATION n. the act of hydroxylating.
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| HYDROXYPROLINE | • hydroxyproline n. (Biochemistry) A hydroxy derivative of the amino acid proline found in the structural proteins of connective tissue. • HYDROXYPROLINE n. an amino acid.
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| INTRODUCTORILY | • introductorily adv. By way of introduction. • INTRODUCTORY adv. serving to introduce, also INTRODUCTIVE.
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| LABYRINTHODONT | • labyrinthodont adj. (Zoology) Having teeth with a labyrinthine (maze-like) internal structure. • labyrinthodont n. Any extinct amphibian of the subclass Labyrinthodontia.
 • LABYRINTHODONT n. an extinct amphibian, so called from a mazy pattern on a section of its teeth.
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| MONOGLYCERIDES | • monoglycerides n. Plural of monoglyceride. • MONOGLYCERIDE n. any of various esters of glycerol in which only one of the three hydroxyl groups is esterified and which are often used as emulsifiers.
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| NEURORADIOLOGY | • neuroradiology n. The radiology of the nervous system; especially the use of radiation to diagnose and treat disorders… • NEURORADIOLOGY n. radiology of the nervous system.
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| PERIODONTOLOGY | • periodontology n. (Dentistry) Periodontics. • PERIODONTOLOGY n. the branch of dentistry concerned with periodontal diseases.
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| RADIOTELEPHONY | • radiotelephony n. The transmission of sound (in both directions) using modulated radio waves rather than wires. • radio␣telephony n. The transmission of speech using modulated radio waves.
 • RADIOTELEPHONY n. communication by radiotelephone.
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