Definition of "undergrown" [un•der•grown]

• Not fully grown; puny. (adjective)
• Covered with undergrowth. (adjective)

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.

• "And a sophisticated tunnel 90 feet undergrown, about 900 feet long, apparently to smuggle drugs from Mexico into the United States."
• "Kirsten Dunst's curly-haired Claudia, the little girl the two men vampirize into their "family," and who comes to hate her eternal entrapment in an undergrown body, manages to assume an eerie agelessness."
• "Patients with a high titer of IgG anticardiolipin and⁄or the lupus anticoagulant are at risk of developing blood clots that result in small, undergrown placentas."