irisation

irisation (countable and uncountable, plural irisations)

1. (meteorology) A colorful optical phenomenon seen in iridescent clouds and on the borders of lenticular clouds resembling those seen in soap bubbles and oil on a water surface.

• AMS Glossary of Meteorology

From iriser +‎ -ation.

• IPA^(key): /i.ʁi.za.sjɔ̃/

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irisation f (plural irisations)

1. iridescence

• “irisation”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.