lepto-

1.
a combining form meaning “thin,” “fine,” “slight,” used in the formation of compound words:
leptophyllous.
Also, especially before a vowel, lept-.
Origin
< Greek lepto-, combining form of leptós thin, slight, fine, literally, stripped, equivalent to lép(ein) to strip + -tos adj. suffix
British Dictionary definitions for lepto-

lepto-

combining form
1.
fine, slender, or slight: leptosome
Word Origin
from Greek leptos thin, literally: peeled, from lepein to peel
lepto- in Medicine

lepto- or lept-
pref.
Slender; thin; fine: leptocyte.