junk ring

短语

词形变化

junk rings 复数 junk rings

释义与例句

n.
  1. 1.

    A wide ring which fits in a groove around the piston of an internal combustion engine to keep it steamtight by retaining the packing in place.

词源

From junk + ring, first use appears c. 1839 in the writings of Robert Spencer Robinson.

来源：wiktionary