Jacobsons organ

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Ja′cob•son's or′gan

(ˈdʒeɪ kəb sənz)

either of a pair of olfactory pockets in the roof of the mouth, absent in primates but well-developed in many vertebrates, esp. reptiles.
[1870–75; after Latin. Latin. Jacobson (1783–1843), Danish anatomist]
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