Methoxy group
= Methoxy group
A <methoxy group> is $\mathrm{-OCH_3}$, a methyl group attached to the rest of a molecule through oxygen. It is an alkoxy substituent and must be distinguished from an attached hydroxyl group.
On an aromatic ring, its oxygen lone pairs can donate into the conjugated system. At the same time, oxygen's electronegativity produces inductive effects, so different electronic contributions must be separated when predicting reactivity.