λεπτός, -ή, -όν (λέπω, to peel), __1. peeled. __2. fine, thin, small, light; hence, in late Gk., as subst. τὸ λ., a small coin (one-eighth of an as, AV, mite): Refs Mrk.12:42, Luk.12:59 21:2.† (AS)
Thayer:
1) thin, small 2) a small brass coin, equivalent to the eighth part of an "as", worth about a 1/5 of a cent
λεπτόν
lepton
lep-ton'
Neuter of a derivative of the same as G3013; something scaled (light), that is, a small coin