Wordnet 3.0
NOUN (1)
1.
a channel in which a tidal current runs;
The Collaborative International Dictionary of English v.0.48:
Tideway \Tide"way`\, n.
Channel in which the tide sets.
[1913 Webster]
WordNet (r) 3.0 (2006):
tideway
n 1: a channel in which a tidal current runs