odontoid
Concise Oxford English Dictionary © 2008 Oxford University Press:
odontoid /ə(ʊ)ˈdɒntɔɪd/ (also odontoid process)
▶noun Anatomy a projection from the second cervical vertebra (axis) on which the first (atlas) can pivot.
– origin C19: from Gk odontoeidēs, from odous, odont- ‘tooth’ + eidos ‘form’.
'odontoid' also found in these Oxford entries:

