Crossword clues for the word: ECS The word ECS has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for ECS Showing 1 to 5 of 5 results Clue(s) "Prefixes meaning ""out of.""" Chest muscles: p___ Elitegroup Computer sys. Engineering Corps units: Abbr. Prefixes for outside