〘Epime〙 (para) A word used in chemistry etc. to distinguish between similar substances. ① Indicates the position of a substituent. A term opposite to ortho and meta, referring to the case where two substituents are at the farthest position on a benzene nucleus. Abbreviated as p-. For example, paraxylene. ② Indicates the difference in the spin of the atomic nucleus. For example, parahydrogen. ③ Indicates a polymer. For example, paraaldehyde. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
〘語素〙 (para) 化学などで、よく似た物質を区別するときに用いる語。① 置換基の位置を示す。オルト、メタに対する語でベンゼン核ではいちばん遠い位置に二つの置換基がはいった場合である。p- と略記する。パラキシレンなど。② 原子核のスピンの違いを表わす。パラ水素など。③ 重合体を意味する。パラアルデヒドなど。
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