from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Partly or moderately rigid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Partially rigid
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not fully rigid
- adj. having a form maintained by a rigid internal structure as well as by internal gas pressure
semi- + rigid (Wiktionary)