| diapason | (noun) either of the two main stops on a pipe organ | Synonyms: diapason stop |
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| diapedesis | (noun) passage of blood cells (especially white blood cells) through intact capillary walls and into the surrounding tissue | - |
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| diapensia | (noun) any boreal low-growing evergreen plant of the genus Diapensia | - |
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| diaper | (noun) garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement | Synonyms: napkin, nappy |
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| (noun) a fabric (usually cotton or linen) with a distinctive woven pattern of small repeated figures | - |
| diaphanoscope | (noun) An instrument for illuminating the interior of a cavity to determine the translucency of its walls. | - |
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| diaphanous | (adjective) so thin as to transmit light | Synonyms: cobwebby, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| diaphone | (noun) a foghorn that makes a signal consisting of two tones | - |
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| diaphoresis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: hidrosis, perspiration, sudation, sweating |
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| diaphoretic | (adjective) inducing perspiration | Synonyms: sudorific |
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| (noun) used to produce perspiration | - |
| diaphragm | (noun) a mechanical device in a camera that controls size of aperture of the lens | Synonyms: stop |
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| (noun) electro-acoustic transducer that vibrates to receive or produce sound waves | - |
| (noun) a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix | Synonyms: contraceptive diaphragm, pessary |
| (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: midriff |
| diaphyseal | (adjective) relating to the diaphysis of a bone | Synonyms: diaphysial |
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| diaphysial | (adjective) relating to the diaphysis of a bone | Synonyms: diaphyseal |
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| diaphysis | (noun) the main (mid) section of a long bone | Synonyms: shaft |
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| diapir | (noun) a domed rock formation where a core of rock has moved upward and pierced through the more brittle overlying strata | - |
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| diapsid | (noun) reptile having a pair of openings in the skull behind each eye | Synonyms: diapsid reptile |
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