American Heritage Dictionary
(1)
Century Dictionary
(7)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Tooth orientation: M: mesial, D: distal, V: vestibular, and L: lingual.— PLoS ONE Alerts: New Articles
Newer techniques such as vestibular stimulation (introduction of water to the inner ear) have shown promising results in pain relief.— Brain Blogger
Pedro has no problem with fluorescent lights (and I assume CFL's) because he is fortunate enough to not have sustained an injury which compromised his vestibular system.— Tech Beat - BusinessWeek

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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