fluxion

noun

1. (countable, obsolete, uncountable)The derivative of a function.
2. (archaic, countable, rare, uncountable)The action of flowing.

   “Perhaps he meant that towns are after all excrescences, grey fluxions, where men, hurrying to find one another, have lost themselves.”

3. (archaic, countable, rare, uncountable)A difference or variation.

verb

1. To be distributed in a flowing pattern.

   “...pilotaxitic texture connotes abundant plagioclase microlites prominently fluxioned in an overall sub-parallel manner and locally around phenocrysts (but strictly in a holocrystalline non-glassy matrix).”