Crossword clues for the word: ECTODERM The word ECTODERM has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for ECTODERM Showing 1 to 5 of 5 results Clue(s) Outer germ layer Outer germ layer that develops into skin Outer membrane of a jellyfish Outer membrane. Outermost cell layer