Crossword clues for the word: ECAD The word ECAD has appeared as an answer to at least 10 crossword clues on different crossword puzzles. Crossword clues for ECAD Showing 1 to 10 of 10 results Clue(s) "Organism, in biology." Acquired character Environmental unit Habitat plant. Modified organism Modified plant species Modified plant. Organism modified by environment Plant form Plant modified by environment.