sidereus

sīdus (“a star”, “a constellation”, stem: sīder-) +‎ -eus (suffix forming adjectives from nouns)

• (Classical) IPA^(key): /siːˈde.re.us/, [s̠iːˈd̪ɛreʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /siˈde.re.us/, [siˈd̪ɛːreus]

sīdereus (feminine sīderea, neuter sīdereum); first/second-declension adjective

1. of, pertaining to, or consisting of a stellar object or objects
   1. of or belonging to the stars
      1. full of stars, starry
   2. of or belonging to the stellar constellations
   3. of or belonging to the Sun
2. (transferred senses):
   1. like a star or the stars in terms of beauty, brightness, brilliance, magnitude, majesty, etc.
   2. (in general) bright, glittering, shining, excellent, shiny, sparkling
   3. (poetic, especially of heroes or the gods) heavenly, divine, brilliant

First/second-declension adjective.

• “sīdĕrĕus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “sidereus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• sīdĕrĕus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette, page 1,438.
• “sīdereus” on page 1,756/2 of the Oxford Latin Dictionary (1st ed., 1968–82)