also: ちゃん
noun
asphalt; bitumen
Technical term for asphalt or bitumen, used in construction and materials science.
道路の舗装には歴青が使われている。
Asphalt is used for road paving.
歴青は防水材としても利用される。
Bitumen is also used as a waterproofing material.
Katakana loanword from English 'tar' or related term; used in some technical contexts.
Variant kanji form; less common than 歴青.
More common everyday term for asphalt; 歴青 is a technical/scientific term.
Kanji compound of 歴 (passage of time) and 青 (blue/green), possibly from the appearance or historical processing of bitumen. The exact derivation is uncertain.