aza

Noun

attributive uncountable

(chemistry, attributive) A nitrogen atom substituted for a carbon atom within a ring.

Japanese Meaning

環状構造中の炭素原子が窒素原子に置き換わった化学種

An aza in the heterocyclic ring can significantly alter the electronic properties of the molecule.

環状化合物の環内で炭素原子が窒素原子に置換されると、分子の電子的性質が大きく変わることがある。

Sense（1）

(chemistry, attributive) A nitrogen atom substituted for a carbon atom within a ring.

However, aza N-atoms (~N=) have to be counted, if they replace methine groups in the chain.