This one is delicious.
from col– together + –loquium speaking, from loqui to speak
All the modern dictionaries mention that it’s specific to elevated speech/conversation. Interesting that “colloquial” is used to mean common speech.
‘the light was coruscating through the walls’
Early 18th century from Latin coruscat- ‘glittered’, from the verb coruscare.
NB: Never doubt my commitment to Sparkle Motion.