Hěnduō hándàn huán huàhéwù de míngchēng yòng ā zì.
Many nitrogen-ring compound names use the character ā.
Tips
usage
In this reading 吖 is a purpose-built chemistry character for transliterating organic compound names containing a nitrogen ring, as in 吖啶 (acridine). You'll only meet it in chemistry textbooks.
The mouth radical 口 appears because the character was coined as a sound-transliteration glyph; the mouth marks it as a phonetic loan rather than a meaning-bearing word.
