/kal dair"ee euhm/ , n. , pl. caldaria /-dair"ee euh/ .
(in an ancient Roman bath) a room having a hot bath.
[ 1745-55; caldarius of warming, equiv. to cal ( i ) d ( us ) warm ( cal ( ere ) to be warm + -idus -ID 4 ) + -arius -ARY; see -IUM, -ARIUM ]