Etymology

photoelastic

P3H4O1T1O1E1L1A1S1T1I1C3

Today it means: exhibiting birefringence when stressed Full definition →

English elastic ← French élastique ← Ancient Greek φωτο- (phōto-)
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The story

  1. Proto-Indo-European*bʰeh₂-
  2. Proto-Indo-European*bʰéh₂os
  3. Proto-Hellenic*pʰáwos
  4. Ancient Greekφᾰ́ος (phắos)
  5. Ancient Greekφῶς (phôs)
  6. Ancient Greekφωτο- (phōto-)
  7. Englishphoto-
  8. Frenchélastique
  9. Englishelastic
  10. English todayphotoelastic

From photo- + elastic.

Etymology from Wiktionary, CC BY-SA 4.0.