Where does “coignimbrite” come from?

coignimbrite (English) comes from English co, from English company, from Middle English companye, from Old French compaignie, from Old French compain, from Latin compāniō, from Latin com-, from Latin con- — resin, gum; to say, speak.

coignimbrite (English): Deposited at the same time or from the same volcanic eruption as an ignimbrite or ash-flow tuff from a pyroclastic density current or caldera-forming eruption, as with ash or volcanic lag breccia