| ectoblast | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoderm, exoderm |
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| ectoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, exoderm |
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| ectomorph | (noun) a person with a thin body | - |
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| ectomorphy | (noun) slender, weak, and lightweight | Synonyms: asthenic type |
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| ectoparasite | (noun) any external parasitic organism (as fleas) | Synonyms: ectozoan, ectozoon, epizoan, epizoon |
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| ectopia | (noun) abnormal position of a part or organ (especially at the time of birth) | - |
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| ectoplasm | (noun) the outer granule-free layer of cytoplasm | - |
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| (noun) (spiritualism) a substance supposed to emanate from the body of the medium during a trance | - |
| ectoproct | (noun) sessile mossy aquatic animal having the anus of the polyp outside the crown of tentacles | - |
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| ectotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: poikilotherm |
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| ectozoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoon, epizoan, epizoon |
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| ectozoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, epizoan, epizoon |
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