Bo·​nel·​lia | \ bōˈnelēə, bə- \

Definition of Bonellia

: a genus of marine worms (group Echiuroidea) that exhibit marked dimorphism and size disparity between the sexes, the male living parasitically in the nephridium of the female and that have what appears to be a unique mechanism of sex determination, the indifferent larva becoming a male if it settles on the proboscis of a mature female and becoming a female if it develops independently on the sea bottom

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

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!

History and Etymology for Bonellia

New Latin, from Francesco A. Bonelli †1830 Italian naturalist + New Latin -ia

Learn More About Bonellia

Dictionary Entries Near Bonellia

bone lace


bone marrow

See More Nearby Entries 

Statistics for Bonellia

Cite this Entry

“Bonellia.” Dictionary, Merriam-Webster, Accessed 7 Jul. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!