Definition of presphenoid in US English:

presphenoid

noun

Anatomy Zoology
  • A bone of the floor of the cranium, anterior to the sphenoid bone.

adjective

Anatomy Zoology
  • Situated anterior to the sphenoid; of or designating the presphenoid.

Origin

Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From pre- + sphenoid.

Pronunciation

presphenoid

/priːˈsfiːnɔɪd/