LATIN PREFIX 11 DE-(=down, down from, opposite of) decadent (literally, "falling down") deteriorating; growing worse; declining deciduous having leaves that fall down at the end of the growing season; sheding leaves demented out of (down from) one's mind; mad; insane; deranged demolish pull or tear down; destroy demote move down in grade or rank dependent (literally, "hanging down from") unable..