n. 俗人, 门外汉, 凡人

[医] 外行, 业外人

[经] 外行

[ noun ]
someone who is not a clergyman or a professional person
<noun.person>

Layman \Lay"man\n.; pl. {Laymen}. [Lay, adj. + man.]
1. One of the people, in distinction from the clergy; one of
the laity; sometimes, a man not belonging to some
particular profession, in distinction from those who do.

Being a layman, I ought not to have concerned myself
with speculations which belong to the profession.
--Dryden.

2. A lay figure. See under {Lay}, n. (above). --Dryden