Thermae would be heated by a log fire before being channelled into the hot bathing rooms. The design of baths is discussed by Vitruvius in "De Architectura". "Thermae, balneae, balineae, balneum" and "balineum" may all be translated as "bath" or "baths", though Latin sources distinguish among these terms. "Balneum" or "balineum", derived from the Greek signifies, in its primary sense, a bath or bathing-vessel, such as most persons of any consequence among the Romans possessed in their own houses, and hence the chamber which contained the bath, which is also the proper translation of the word "balnearium". The diminutive "balneolum" is
Thermae singular number, were the public baths. But this accuracy of diction is neglected by many of the subsequent writers, and particularly by the poets, amongst whom "balnea" is not uncommonly used in the plural number to signify the public baths, since the word "balneae" could not be introduced in a hexameter verse. Pliny also, in the same sentence, makes use of the neuter plural "balnea" for public, and of "balneum" for a private bath. "Thermae" (Greek: , "Thermai", "hot springs, hot baths", from the Greek adjective "thermos", "hot") meant properly warm springs, or baths of warm water; but came to