Latin word caldarius comes from Latin caldum, Latin -arium

Detailed word origin of caldarius

Dictionary entry	Language	Definition
caldum	Latin (lat)
-arium	Latin (lat)	Used to form nouns denoting a "place where things are kept" from other nouns.
caldarius	Latin (lat)	Of, pertaining to or suitable for warmth or bathing.. Supplied with hot water.. Used for hot water.

Words with the same origin as caldarius