[hee-lee-op-uh-lis] /ˌhi liˈɒp ə lɪs/
Biblical name On. an ancient ruined city in N Egypt, on the Nile delta.
ancient Greek name of .
(in ancient Egypt) a city near the apex of the Nile delta: a centre of sun worship Ancient Egyptian name On
the Ancient Greek name for Baalbek
[hee-lee-uh-skohp] /ˈhi li əˌskoʊp/ noun 1. a telescope for viewing the sun, adapted to protect the eye of the viewer from the sun’s glare.
noun the study of the sun’s interior by the analysis of its oscillations and sound waves passing through it See asteroseismology Word Origin helio- ‘sun’ + seismology
[hee-lee-uh-sfeer] /ˈhi li əˌsfɪər/ noun, Astronomy. 1. the region around the sun over which the effect of the solar wind extends. /ˈhiːlɪəʊˌsfɪə/ noun 1. the region around the sun outside of which the sun’s influence is negligible and interstellar space begins heliosphere (hē’lē-ə-sfîr’) The large, roughly elliptical region of space around the Sun through which […]
[hee-lee-uh-stat] /ˈhi li əˌstæt/ noun 1. an instrument consisting of a mirror moved by clockwork, for reflecting the sun’s rays in a fixed direction. /ˈhiːlɪəʊˌstæt/ noun 1. an astronomical instrument used to reflect the light of the sun in a constant direction