Also found in: Thesaurus, Medical, Idioms.
1. Lying with the front or face downward.
2. Having a tendency; inclined. Often used in combination: paper that is prone to yellowing; an accident-prone child.
In a prone manner: The patient was lying prone on the bed.
[Middle English, inclined, disposed, from Latin prōnus, leaning forward; see per in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.