| 释义 |
buttonhead
I. \ˈ ̷ ̷ ̷ ̷| ̷ ̷\ adjective
of a bolt, rivet, or screw : having a head with a spherical exposed surface and plane shoulder, the height of the head being usually less than a hemisphere
II. noun
: a buttonhead bolt, screw, or rivet — see rivet illustration |