Is “Seismic” a Scrabble word?
Yes
SEISMIC
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Seismic
/ˈsaɪzmɪk/
adjective
1.Related to, or caused by an earthquake or other vibration of the Earth.
2.Of very large or widespread effect.