1. The expanded mouth of a river, forming an arm of the sea, and extending inwards as far as the flow by the tide, so called from the boiling appearance where the tide flows up; a frith.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• stoary,
• esstuary,
• esturary,
• entury,
• estar,
• estay,
• usuary,
• estacy,
• stury,
• estart,
• estury,
• estasy,
• estudy,
• estare,
• astary,
• essary,
• entary,
• eastury,
• estaury,
• estuarary

• estuarial,
• astray,
• estuarine.

The adjective form of the word "estuary" is "estuarine"

The plural of the "estuary" can be the "estuaries".

The singular of the "estuary" can be the "estuary".