Crossword clues for the word: GRISSOM The word GRISSOM has appeared as an answer to at least 11 crossword clues on different crossword puzzles. Crossword clues for GRISSOM Showing 1 to 11 of 11 results Clue(s) "Gil ___, original lead role on ""CSI""" Astronaut Gus Astronaut Virgil (Gus) ___ First American to go into space twice First man to fly in space twice Forensic entomologist Gil played by William Petersen on "CSI: Vegas" GUS Gus who rocketed Head guy on CSI Second American in space Second American to fly in space