One of the mysteries of the English language finally explained.
A bulb-like terminal expansion of the telencephalon on which the olfactory nerve fibres end.
Mid 19th century; earliest use found in Robley Dunglison (1798–1869), physician and medical writer. From olfactory + bulb, apparently after post-classical Latin bulbus olfactorius.
olfactory bulb/ɒlˌfakt(ə)ri ˈbʌlb/
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