Portland screw
noun
A hollow cast of the spiral shell of the gastropod Aptyxiella portlandica, as found in Portland stone.
Origin
Late 19th century; earliest use found in Charles Lyell (1797–1875), geologist.
| 单词 | Portland screw |
| 释义 | Portland screwnoun A hollow cast of the spiral shell of the gastropod Aptyxiella portlandica, as found in Portland stone. Origin |
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