polydisperse
/ˌpɒlɪdɪˈspəːs/Physical Chemical
adjective
Existing in the form of or containing colloidal particles having a range of sizes; especially designating macromolecular substances in which there is a simple distribution of particle size with one peak; relating to such a distribution.
Origin
Early 20th century; earliest use found in Martin Fischer (b. 1879). From German polydispers from poly- + dispers.