diathermancy: meaning, definition, pronunciation and examples
Very Rare / Technical TermHighly technical / Scientific
Quick answer
What does “diathermancy” mean?
The property of allowing infrared (radiant heat) radiation to pass through a material.
Audio
Pronunciation
Definition
Meaning and Definition
The property of allowing infrared (radiant heat) radiation to pass through a material.
In physical sciences and medicine, the quality of a substance that is transparent to thermal radiation; the capacity of a medium to transmit heat by radiation.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage; the word is identical and equally rare in both varieties. British texts may use the related term 'diathermy' more frequently in a medical context.
Connotations
Purely technical and scientific; no cultural or regional connotations.
Frequency
Extremely low frequency in both varieties. Almost exclusively found in specialized scientific or engineering literature from the late 19th to mid-20th century. Largely superseded by more modern terminology like 'thermal transmittance' or 'infrared transparency' in contemporary texts.
Grammar
How to Use “diathermancy” in a Sentence
The diathermancy of [material][Material] exhibits/possesses/show diathermancy.to measure/study/investigate the diathermancyVocabulary
Collocations
Examples
Examples of “diathermancy” in a Sentence
adjective
British English
- The experiment required a diathermanous substance like rock salt for the infrared spectrometer.
American English
- Researchers selected a highly diathermanous material for the window of the thermal chamber.
Usage
Meaning in Context
Business
Not used.
Academic
Used historically in physics and engineering papers on heat transfer, now largely archaic.
Everyday
Never used.
Technical
The primary domain. Found in older technical manuals, thermodynamic treatises, and some historical medical texts related to diathermy equipment.
Vocabulary
Synonyms of “diathermancy”
Strong
Neutral
Weak
Vocabulary
Antonyms of “diathermancy”
Watch out
Common Mistakes When Using “diathermancy”
- Misspelling as 'diathermacy' or 'diathermancy' (wrong vowel).
- Confusing it with 'conductivity' (which is for heat transfer via direct contact).
- Using it as a general synonym for 'insulation' (it is the opposite for radiant heat).
FAQ
Frequently Asked Questions
No, it is an extremely rare and specialised technical term from physics, now considered largely archaic.
Diathermancy refers specifically to the transmission of heat by radiation (infrared waves). Thermal conductivity refers to the transfer of heat through a material by direct molecular contact (conduction).
A pane of glass has high diathermancy for visible light but lower diathermancy for certain infrared wavelengths, which is why a greenhouse gets warm—sunlight (visible) enters, but the heat radiation (infrared) from inside has more difficulty escaping.
The concept is fundamental, but the word itself is rarely used in contemporary scientific writing. Modern terms like 'infrared transmittance', 'radiative heat transfer coefficient', or 'thermal emissivity/absorptivity' are preferred.
The property of allowing infrared (radiant heat) radiation to pass through a material.
Diathermancy is usually highly technical / scientific in register.
Diathermancy: in British English it is pronounced /ˌdaɪ.əˈθɜː.mən.si/, and in American English it is pronounced /ˌdaɪ.əˈθɝː.mən.si/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: DIAna THERMan CYcle. Diana cycles through a thermal (heat) barrier because of her special suit's property of DIATHERMANCY.
Conceptual Metaphor
TRANSPARENCY FOR HEAT (as glass is transparent to light, a diathermanous substance is 'transparent' to radiant heat).
Practice
Quiz
Diathermancy is most closely related to which physical phenomenon?