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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Astronomer's bear 4 letters:

URSA: Astronomical bear
URSA: Either Bear, astronomically.
URSA: Astronomer's bear
URSA: Bear, to astronomers
URSAE: Bears, to astronomers and other Latin-speakers