HELIACAL
\hˈɛlɪˌakə͡l], \hˈɛlɪˌakəl], \h_ˈɛ_l_ɪ__ˌa_k_əl]\
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pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun; "the heliacal rising of the Dog Star"; "the heliacal or Sothic year is determined by the heliacal rising of Sothis (the Egyptian name for the Dog Star)"
By Princeton University
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HELIACALLY.
By Daniel Lyons
By James Champlin Fernald