An Etymological Dictionary of Astronomy and Astrophysics

Any transmission medium, such as a hollow metal conductor, coaxial cable, or glass fiber, capable of confining and supporting the propagation of electromagnetic waves regardless of wavelength or mode of propagation.

Etymology (EN): → wave; guide, M.E., from O.Fr. guider “to guide, lead,” from Frankish *witan “show the way,” from P.Gmc. *wit- “to know” (cf. Ger. weisen “to show, point out,” wissen “to know;” O.E. witan “to see”). Cognate with Pers. bin- “to see” (present stem of didan “to see”); Mid.Pers. wyn-;
O.Pers. vain- “to see;” Av. vaēn- “to see;”
Skt. veda “I know;” Gk. oida “I know,” idein “to see;” L. videre “to see;” PIE base *weid- “to know, to see.”

Etymology (PE): Mowjbar, from mowj, → wave, + -bar “carrier,” from bordan “to carry, lead” (Mid.Pers. burdan,
O.Pers./Av. bar- “to bear, carry,” barəθre “to bear (infinitive),” Skt. bharati “he carries,” Gk. pherein, L. fero “to carry;” PIE base *bher- “to carry”).