the.com/layperson
Someone who hasn't drunk your field's Kool-Aid, and asks the dumb questions that turn out smart.
means A person without specialized professional or expert knowledge in a particular subject.
from From the Old French lai and Greek laikos, meaning of the people, as opposed to the ordained clergy who alone knew the holy stuff.
Church rootsOriginally meant non-clergy, before fields claimed it.
Useful testExplain it to one to prove you understand.
Gender updateLayperson replaced layman to ditch the assumption.