A synthetic opiate opioid that is 100 times more potent than fentanyl and 10,000 times more potent than morphine.

(soccer) penalty box

plural of 18-yard box

(soccer) The line on the pitch, 18 yards from the goal line, marking the outside of the penalty box

plural of 18-yard line

World War I

(organic chemistry) The crown ether 1,4,7,10,13,16-hexaoxacyclooctadecane

(US) Police code for murder, in the State of California.

(sports) An instance of spinning 180 degrees, so that one is facing in the opposite direction. / (figuratively) The exact opposite.

plural of 180