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There are 11 twelve-letter words containing SEIS

MICROSEISMIC	• microseismic adj. Describing any small seismic event that causes little or no damage or disturbance. • MICROSEISMIC adj. relating to a microseism, a small earth tremor, also MICROSEISMICAL.
SEISMICITIES	• seismicities n. Plural of seismicity. • SEISMICITY n. the degree of vulnerability to earthquakes.
SEISMOGRAPHS	• seismographs n. Plural of seismograph. • SEISMOGRAPH n. an instrument for recording earthquakes.
SEISMOGRAPHY	• seismography n. The measurement and recording of earthquakes and other ground vibrations. • seismography n. The study of these records, seismology. • SEISMOGRAPHY n. measurement by use of the seismograph.
SEISMOLOGIES	• SEISMOLOGY n. the study of earthquakes.
SEISMOLOGIST	• seismologist n. A person who is skilled at, professes, or practices seismology. • SEISMOLOGIST n. one who studies earthquakes.
SEISMOMETERS	• seismometers n. Plural of seismometer. • SEISMOMETER n. an instrument for measuring earthquake intensity.
SEISMOMETRIC	• seismometric adj. Of or pertaining to seismometry. • SEISMOMETRIC adj. relating to measurement by seismometer, also SEISMOMETRICAL.
SEISMONASTIC	• seismonastic adj. Of or relating to seismonasty. • SEISMONASTIC adj. relating to seismonasty, response to mechanical shock.
SEISMOSCOPES	• seismoscopes n. Plural of seismoscope. • SEISMOSCOPE n. an instrument for detecting earthquakes.
SEISMOSCOPIC	• seismoscopic adj. Relating to the seismoscope. • SEISMOSCOPIC adj. pertaining to a seismoscope, an instrument for detecting earthquakes.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 36 words
Scrabble in French: 8 words
Scrabble in Spanish: 2185 words
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 41 words

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