Etymology
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intertidal (adj.)

also inter-tidal, "between the high and low water marks," 1853, from inter- + tidal (adj.).

updated on December 21, 2015

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Definitions of intertidal from WordNet

intertidal (adj.)
of or relating to the littoral area above the low-tide mark;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.