American Heritage Dictionary
(1)
Century Dictionary
(15)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Of medium length, broad between the ears; forehead line seen in profile is moderately arched; zygomatic arch and stop well developed with strong broad upper and lower jaws.
A. the mandible B. the zygomatic bone C. the maxilla D. the nasal E. the mastoid— Recently Uploaded Slideshows
A forced smile flexes only the zygomatic major, raising the corners of the lips.— COSMOS magazine - The science of everything
The Duchenne smile, in the presence of genuine emotion, flexes not only the zygomatic but also the orbicularis oculi, pars orbitalis muscle which encircles the eye and gives the distinctive— COSMOS magazine - The science of everything
Her zygomatic major twitched, briefly pulling the corners of her mouth up and back.— COSMOS magazine - The science of everything

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 once a year.
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