Definition of Neocomian in US English:

Neocomian

adjective

Geology
  • Of, relating to, or designating the oldest part of the Lower Cretaceous period, or the series of rocks laid down at that time (originally specifically in Switzerland and France).

noun

Geology
  • Frequently with the. The Neocomian period; the series of rocks laid down during this time.

Origin

Mid 19th century; earliest use found in Proceedings of the Geological Society of London. From French Néocomien from post-classical Latin Neocomium (from ancient Greek νέος new + κώμη village + -ium), Latinized form of Neuchâtel, the name of a city in the Jura mountains of Switzerland + French -en.

Pronunciation

Neocomian

/ˌniːə(ʊ)ˈkəʊmɪən/