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
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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.
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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
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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 12 Jul. 2025.
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