Pronunciation: [dˌa͡ɪəθˈɜːmə͡l] (IPA) 
Diathermal is spelled with seven letters and pronounced as "dʌɪəˈθɜːməl". The first syllable "dai" is pronounced as "day" with a short "i" sound, followed by "ə" which is pronounced as a schwa or a neutral vowel sound. The third syllable "θer" is pronounced as "ther" with a voiceless "th" sound, followed by a short "a" sound in "mal". The word, derived from the Greek language, means allowing heat to pass through.
Diathermal is an adjective that refers to a substance or material that allows the passage of heat or thermal energy through it. It derives from the Greek word "dia" which means "through" and "therm" which means "heat."
In physics and thermodynamics, diathermal substances are typically characterized by their ability to conduct heat or transfer thermal energy easily. They exhibit a high thermal conductivity, allowing heat to flow from one side of the material to the other without significant resistance or hindrance. This property is often observed in metals and certain types of solids that possess a well-defined crystal lattice structure.
The diathermal property of a substance is essential in various applications. For instance, in the design and construction of efficient heat exchangers and thermal insulation systems, materials with diathermal properties are preferred to facilitate the transfer of heat and maintain temperature regulation. Diathermal substances also play a crucial role in thermodynamic studies, as they allow for accurate measurements and analysis of heat flow and temperature changes in experiments.
It is worth noting that the term diathermal is primarily used in the field of thermodynamics and may not have a common or widely recognized usage in everyday language. However, within the scientific community, it is an important term to describe the heat transfer characteristics of materials and the behavior of thermal energy in various systems.
Diathermanous.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Allowing rays of heat to pass through.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "diathermal" is derived from the Greek roots "dia-", meaning "through", and "thermē", meaning "heat".
