| 释义 |
per·fo·ra·tion
\ˌpərfəˈrāshən, ˌpə̄f-, ˌpəif-\ noun
(-s)
Etymology: New Latin, from Latin perforatus + New Latin -orium — more at perforate
1. : the act or process of perforating
< a machine for the perforation of a sheet of stamps at one stroke >
specifically : the penetration of a body part through accident or disease
< spontaneous perforation of the sigmoid colon in the presence of diverticulosis — Journal American Medical Association >
2.
a.
(1) : a hole or pattern made by piercing or boring
< perforations on the edge of the film engage sprockets in the projector >
< mark all perforations which indicate seams, darts … and buttonhole locations — Needlecraft for the Home >
< overprints gave way to perforations — Gordon Ward >
specifically : a series or one of a series of holes made in a shoe upper for ornament or ventilation
(2) : a series of small incisions to facilitate tearing along a predetermined line
b.
(1) : one of the series of holes made between rows of postage stamps in a sheet — compare pin perforation, roulette
(2) : one of the teeth on the edge of a detached stamp resulting from tearing along the series of holes
(3) or perforation number : a philatelic classification based on the number of perforations along the edge of a stamp per 20 millimeters
c. : a rupture in a body part caused by accident or disease
d. : a natural opening in an organ or body part
< small perforations opening at the bottom of the sulci — Ferdinand Canu & R.S.Bassler > |