A Grammatical Dictionary of Botanical Latin

Thermometrum,-i (s.n.II), abl.sg. thermometro: a thermometer, a device for measuring temperature [> Gk. therm-, thermo- pertaining to heat, hot- + metron (s.n.II), that by which anything is measured;;

- aquae thermales plurimae et quaedam calidissimae, quales sunt quae ‘Hamam Miscroutin’ appellantur, ab urbe Bone non longe distantes; hae thermometrum Reaumurii usque ad gradus 77 elevant (Desf.), there are very many warm springs and some extremely hot, as for instance that are those which are called ‘Hamam Miscroutin,’ not far distant from the city Bone; these raise the thermometer of Reaumur as far as 77 degrees.

NOTE: Hamam = ‘Turkish Bath’ or spa, introduced by the Romans. The Reaumur thermometer, which used ethanol rather than mercury, measured temperature in 80 units or degrees between the melting point of ice, and the boiling point of water at ‘normal’ pressure; created in 1731 by the physicist René-Antoine Ferchault de Réaumur (Wikipedia Sept. 2017).