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pro·so·ma | \ (ˌ)prō-ˈsō-mə 
\
\Definition of prosoma
: the anterior region of the body of an invertebrate (such as an arachnid) especially when the segmentation is suppressed or obscured especially : cephalothorax
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Merriam-Webster unabridgedWords at Play
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The first known use of prosoma was in 1853
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