noun Informal.

by shortening

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a combining form meaning “thin,” “fine,” “slight,” used in the formation of compound words: leptophyllous.
Also, especially before a vowel, lept-.

< Greek lepto-, combining form of leptós thin, slight, fine, literally, stripped, equivalent to lép(ein) to strip + -tos adj. suffix

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World English Dictionary
lepto- or (before a vowel) lept-
combining form
fine, slender, or slight: leptosome
[from Greek leptos thin, literally: peeled, from lepein to peel]
lept- or (before a vowel) lept-
combining form
[from Greek leptos thin, literally: peeled, from lepein to peel]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There is no evidence that vaccines against lepto are more likely to cause adverse reactions than any other routine canine vaccine.
Patients with either parenchymal brain or lepto-meningeal involvement.
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