acorn nut

短语

[机] 盖形螺帽

词形变化

acorn nuts 复数 acorn nuts

释义与例句

n.
  1. 1.

    A closed nut having a dome-like cap over the rear protruding part of the engaged screw or bolt.

    工程

词源

From acorn + nut, because it resembles an acorn.

来源：wiktionary