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  • Webster's Revised Unabridged Dictionary
    • n Prosoma (Zoöl) The anterior of the body of an animal, as of a cephalopod; the thorax of an arthropod.
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Century Dictionary and Cyclopedia
    • n prosoma The anterior or cephalic section of the body of a cephalopod, bearing the rays or arms; the head or anterior part of any mollusk, in advance of the mesosoma.
    • n prosoma In dimyarian lamellibranchs, a region of the body in which is the anterior adductor muscle, and which is situated in front of the mouth: it is succeeded by the mesosoma.
    • n prosoma In Cirripedia, the wide part of the body, preceding the thoracic segments: in the barnacle, for example, that part which is situated immediately behind the point of attachment of the body to the shell on the rostral side. Darwin. See cuts under Balanus and Lepadidæ.
    • ***


Webster's Revised Unabridged Dictionary
NL., fr. Gr. before +,, body


In literature:

Instead the terms cephalothorax or prosoma are widely used.
"Explanation of Terms Used in Entomology" by John. B. Smith
The prosoma is well developed.
"A Monograph on the Sub-class Cirripedia (Volume 1 of 2)" by Charles Darwin
I to VI, The six appendage-bearing somites of the prosoma.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various