Word Genius' word today was autoschediastic, meaning "Impromptu, improvised, ex tempore or offhand." I had wondered if it was related to homoscedastic/heteroscedastic, meaning"having the same/different variances." I'm thinking they're not related.
ORIGIN OF AUTOSCHEDIASM
First recorded in 1835–45; from Greek autoschedíasma, derivative, with -(s)ma noun suffix, of autoschediázein “to extemporize,” verbal derivative of autoschédios “hand-to-hand, offhand, improvised,” equivalent to auto- auto-1 + schédios “near, casual, offhand,” derivative of schedón (adverb) “near, close by,” akin to échein “to hold, possess”
WORD ORIGIN FOR HETEROSCEDASTIC
C20: from hetero- + scedastic, from Greek skedasis a scattering, dispersal