[ek-toh-kuh-men-suh l] /ˌɛk toʊ kəˈmɛn səl/
Biology. (of an organism) living in a relationship on the exterior of another organism.
an ectocommensal organism.
[ek-toh-kawr-nee-uh] /ˌɛk toʊˈkɔr ni ə/ noun, Anatomy. 1. the outer layer of the .
[ek-tuh-durm] /ˈɛk təˌdɜrm/ noun, Embryology. 1. the outer germ layer in the embryo of a metazoan. /ˈɛktəʊˌdɜːm/ noun 1. the outer germ layer of an animal embryo, which gives rise to epidermis and nervous tissue See also mesoderm, endoderm n. 1861, from ecto- + -derm. Coined by Prussian embryologist Robert Remak (1815-1865). ectoderm ec·to·derm (ěk’tə-dûrm’) […]
/ˈɛktəʊˌkriːn; -krɪn/ noun 1. 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.