Definition of "hypoplasia" [hypoplasia]

• Incomplete or arrested development of an organ or a part. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If she falls over when blindfolded (because she relies on her eyes for balance), she probably has cerebellar hypoplasia, which is more common in kittens."
• "Macie Morse was born with optic nerve hypoplasia, meaning her optic nerve didn't develop all the way."
• "We also observed other phenotypes commonly associated with RP morphants [17], such as hypoplasia of the yolk sac extension, abnormalities in the ear, and delayed pigmentation of the eyes."