air heading
/ˈɛː ˌhɛdɪŋ/Mining. Now rare
noun
A horizontal passage constructed in order to carry air to part of a mine.
Origin
Mid 19th century. From air + heading. Compare earlier airhead.
| 单词 | air heading |
| 释义 | air heading/ˈɛː ˌhɛdɪŋ/Mining. Now rare noun A horizontal passage constructed in order to carry air to part of a mine. Origin |
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