Definition of photoelastic in US English:

photoelastic

adjective

Engineering
  • Employing or exhibiting the property of becoming birefringent when mechanically stressed, so that stress patterns in such a substance can be determined from the interference fringes formed by polarized light passed through it.

Origin

Early 20th century. From photo- + elastic. Compare earlier photoelasticity.

Pronunciation

photoelastic

/ˌfəʊtəʊɪˈlastɪk/