estuary
noun
[ ˈɛstjʊ(ə)ri ]
• the tidal mouth of a large river, where the tide meets the stream.
Similar:
(river) mouth,
firth,
delta,
embouchure,
debouchure,
debouchment,
discharge,
disemboguement,
inver,
water mouth,
Origin:
mid 16th century (denoting a tidal inlet of any size): from Latin aestuarium ‘tidal part of a shore’, from aestus ‘tide’.