Crossword clues for the word: IGY The word IGY has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for IGY Showing 1 to 5 of 5 results Clue(s) "1982 Donald Fagen hit subtitled ""What a Beautiful World""" 1957-58 sci. project Donald Fagen hit that refers to a scientific event Global milestone of science: Abbr. Recently ended period of scientific activity.