Definition of protoconid in US English:

protoconid

noun

Zoology
  • A cusp on the anterior buccal corner of a mammalian lower molar tooth.

Origin

Late 19th century. From protocone + -id; so named as representing the apex of the primitive conical reptilian tooth.

Pronunciation

protoconid

/ˌprəʊtə(ʊ)ˈkəʊnɪd/