单词 | plummer block |
释义 | plummer block/ˈplʌmə ˌblɒk/(also plumber block) Mechanics noun A cradle for a journal bearing, consisting of a lower part on which sits the shaft or axle in its bearing, and a cap fitting over this, which holds the shaft or axle in place and can be tightened by means of bolts as the surface of the bearing wears away; a pillow block. OriginLate 18th century. From a first element of uncertain origin (perhaps a surname) + block. |
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