1826, in the meaning defined above
New Latin prothorac-, prothorax, from pro- entry 1 + thorax
Keep scrolling for more
Time Traveler for prothorax
See more words from the same year
Cite this Entry
“Prothorax.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prothorax. Accessed 16 Jun. 2021.
More from Merriam-Webster on prothorax
Britannica.com: Encyclopedia article about prothorax
See Definitions and Examples »
Get Word of the Day daily email!
Name that Thing: Dog Breeds
Test your vocabulary with our 10-question quiz!
Spell words. Make bears.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Your ticket to sorting them out
Be dashing—and do it well
Words from the week of 6/11/2021
From the sprightly world of dance
How 'literally' can mean "figuratively"
Thawing one of the mysteries of English
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
Can you correctly identify these breeds?
Just take our word for it.