If you don't know what it means:
hygroscopic =Readily absorbing moisture, as from the atmosphere.
1.Of a substance: tending to absorb moisture from the air L18
Something that's important to consider with composites. Our conversation was about the use of the word 'hydroscopic'. Read more to find out why:
hydroscope (noun): An optical device used for viewing objects far below the surface of water.
If you are using a dictionary, post 1993 (Oxford English definition) you will find this: The words mean exactly the same thing, (‘due to common usage’)
hydroscopic (adj) [ORIGIN from HYDRO -+SOL(UTION]
We all realised that our ages, combined with the age of our school dictionaries and education would probably provide a few more of these in the future.
If you have any more we'd love to hear them.
Thank you to Sgt Nik Badham for this QI moment.