from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
smileinvolving contractionof both the zygomaticmajor muscle (which raises the corners of the mouth) and the orbicularis oculi(which raises the cheeks and forms crow's feetaround the eyes).
from Wiktionary, Creative Commons Attribution/Share-Alike License
After the French physician Duchenne de Boulogne (1806-1875).
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