a substance that is released by an organism into the external environment and influences the development, behaviour, etc, of members of the same or different species
- Ectodermal dysplasia
ectodermal dysplasia n. Abnormal development or growth of tissues and structures that develop from the ectoderm.
ectodermosis ec·to·der·mo·sis (ěk’tō-dər-mō’sĭs) n. pl. ec·to·der·mo·ses (-sēz) A disorder of an organ or tissue developed from the ectoderm.
ectoentad ec·to·en·tad (ěk’tō-ěn’tād’) adv. From without inward.
[ek-toh-en-zahym] /ˌɛk toʊˈɛn zaɪm/ noun, Biochemistry. 1. . /ˌɛktəʊˈɛnzaɪm/ noun 1. any of a group of enzymes secreted from the cells in which they are produced into the surrounding medium; extracellular enzyme Also called exoenzyme ectoenzyme ec·to·en·zyme (ěk’tō-ěn’zīm) n.