English
tidepool
From tide + pool.
Proto-Indo-European *deh₂y- ‘to share, divide’
…
Proto-Germanic *tīdiz ‘time’
Proto-West Germanic *tīdi ‘time’
Old English tīd ‘time in general’
Middle English tyde ‘a time (period), season’
English tide
Proto-Germanic *pōlaz ‘pool’
Proto-West Germanic *pōl
Old English pōl ‘pool’
Middle English pool
English pool
Today it means
noun A rocky pool by the ocean that is filled with seawater left behind by the falling tide.
Sources
Sources: Wiktionary, “tidepool”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / tidepool