ES'TUARY, noun [Latin oestuarium, from oestuo, to boil or foam, oestus, heat, fury, storm.] 1. An arm of the sea; a frith; a narrow passage, or the mouth of a river or lake, where the tide meets the current, or flows and ebbs. 2. A vapor-bath.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI