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heliologist
heliologist n.
Brit. 
/ˌhiːlɪˈɒlədʒɪst/
, /ˌhiːlɪˈɒlədʒɪst/U.S. /ˌhiliˈɑlədʒəst/
one versed in heliology./ˌhiliˈɑlədʒəst/Π
1890 W. E. Gladstone Impregnable Rock (1892) 66 According to heliologists, the process does not even yet appear to be absolutely completed.
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