Definition of protonymphon in US English:

protonymphon

noun

Zoology
  • The larval stage of a pycnogonid arthropod (a sea spider).

Origin

Late 19th century; earliest use found in Thomas Hunt Morgan (1866–1945). From proto- + Nymphon, after French protonymphon.

Pronunciation

protonymphon

/ˌprəʊtə(ʊ)ˈnɪmfɒn/