Meaning

adjective rough to the touch; covered with scales or scurf

originFrom New Latin leprōsus in botany especially as used by Linnaeus in his 1753 Species Plantarum and Late Latin leprōsus in medicine, from lepra (“psoriasis, leprosy”) + -ōsus, from Koine Greek λέπρᾱ (léprā, “psoriasis & similar skin diseases”), from Ancient Greek λεπρός (leprós, “scaly”), from either λεπίς (lepís, “scale”) or λέπος (lépos, “husk, scale”) + -ρος (-ros, “forming adjective”).

Etymology from Wiktionary, CC BY-SA 3.0