seaquake

from WordNet (r) 3.0 (2006)
seaquake
    n 1: an earthquake at the sea bed [syn: {seaquake}, {submarine
         earthquake}]
from The Collaborative International Dictionary of English v.0.48
Seaquake \Sea"quake`\ (s[=e]"kw[=a]k`), n.
   A quaking of the sea.
   [1913 Webster] Sear
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