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“thalassoseisma”
An earthquake at sea, or a "seaquake": A thalassoseisma, an obsolete term, is caused by a quake in the earth at the bed or bottom of a sea or ocean.
This entry is located in the following units:
seismo-, seism-, -seism, -seisms, -seisma, -seismically, -seismical, -seismal, -seismic
(page 5)
thalasso-, thalass-, thalassi-, thalassio-, thalatto-, thalatt- +
(page 3)