Where does “Liassic” come from?

Liassic (English) comes from English Lias, from Old French liois, from Old Irish liae, from Proto-Celtic liyants, from Proto-Indo-European leyH- — flow, flood; to bend; to flow.

Liassic (English): Of or relating to the Lias or its fossils

Definitions

  1. Of or relating to the Lias or its fossils

Ancestry of “Liassic”, step by step

Liassic traces back through two separate lines of ancestry.

via English Lias

StepLanguageWordMeaning
1EnglishLiasA stratigraphic group from the lower Jurassic of Western Europe, consisting of thin layers of blue limestone
2Old Frenchlioiscompact limestone
3Old Irishliaeflood
4Proto-Celticliyantsflood, flow
5Proto-Indo-EuropeanleyH-flow, flood; to bend; to flow

via English ic

StepLanguageWordMeaning
1Englishicrelated or pertaining to; having the character of
Every word from Proto-Indo-European leyH-
Liassic — Etymology, Origin & Word History | Etymology Explorer