The Collaborative International Dictionary
Pleuro-
Pleuro- \Pleu"ro-\ [See Pleura.] A combining form denoting relation to a side; specif., connection with, or situation in or near, the pleura; as, pleuroperitoneum.
Douglas Harper's Etymology Dictionary
pleuro-
before vowels pleur-, word-forming element meaning "pertaining to the side; pertaining to the pleura," from comb. form of Greek pleura (see pleura).
Wiktionary
pleuro-
pre. 1 to the side; lateral 2 (context medicine English) of the pleura