Definition of olfactory bulb in US English:

olfactory bulb

noun

Anatomy Zoology
  • A bulb-like terminal expansion of the telencephalon on which the olfactory nerve fibres end.

Origin

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.

Pronunciation

olfactory bulb

/ɒlˌfakt(ə)ri ˈbʌlb/