NODAL POINT
\nˈə͡ʊdə͡l pˈɔ͡ɪnt], \nˈəʊdəl pˈɔɪnt], \n_ˈəʊ_d_əl p_ˈɔɪ_n_t]\
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Two p's, called respectively the first (or anterior) nodal p. and the second (or posterior) nodal p., situated on the optical axis of a dioptric system, and so related that every incident ray which is directed toward the first p. is represented after refraction by a ray emanating from the second p. and having a direction parallel to that of the incident ray.
By Smith Ely Jelliffe
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hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.