The Collaborative International Dictionary
Liassic
Liassic \Li*as"sic\ (l[-i]*[a^]s"s[i^]k), a. (Geol.) Of the age of the Lias; pertaining to the Lias formation. -- n. Same as Lias.
Wiktionary
liassic
a. (context geology English) (alternative form of Liassic English)
Usage examples of "liassic".
Geologically they are known to date back to the Oligocene period, and wings believed to be referable to them have been found in Liassic and Jurassic beds.