Definition of heteronereis
: a free-swimming dimorphic sexual individual of certain polychaete worms (family Nereidae) characterized by greatly enlarged eyes, enlarged and modified parapodia and other appendages, and more or less complete obliteration of the internal viscera by masses of developing germ cells
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of heteronereis
New Latin, from heter- + Nereis
Seen and Heard
What made you want to look up heteronereis? Please tell us where you read or heard it (including the quote, if possible).