- perimeter (n.)
[perimeter 词源字典]
- early 15c., "line around a figure or surface," from Latin perimetros, from Greek perimetron "circumference," from peri- "around" (see peri-) + metron "measure" (see meter (n.2)). Military sense of "boundary of a defended position" is attested from 1943.[perimeter etymology, perimeter origin, 英语词源]