prosoma
noun
pro·so·ma
(ˌ)prō-ˈsō-mə 
: the anterior region of the body of an invertebrate (such as an arachnid) especially when the segmentation is suppressed or obscured
especially
: cephalothorax
Examples of prosoma in a Sentence
Recent Examples on the Web
When a spider wants to straighten its legs to move, the prosoma section (where its legs attach to its body) ejects fluid into the legs, pushing them out straight.
—
Manasee Wagh, Popular Mechanics, 28 July 2022
The head, or prosoma, houses most vital organs, including the heart and the brain.
—National Geographic, 20 Apr. 2020
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Manasee Wagh, Popular Mechanics, 28 July 2022
The head, or prosoma, houses most vital organs, including the heart and the brain.
—National Geographic, 20 Apr. 2020
Cite this Entry
“Prosoma.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prosoma. Accessed 18 Jul. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share