— tephrochronological /tef'roh kron'l oj"i keuhl/ , adj.
/tef'roh kreuh nol"euh jee/ , n. Geol.
a geochronologic technique based on the dating of layers of volcanic ash. Cf. tephra .
[ 1940-45; tefrokronologi, equiv. to tefr ( a ) volcanic ejecta ( téphra ash) + -o- -O- + kronologi CHRONOLOGY ]