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“scorpion” in Latin

The English word scorpion itself goes back to Latin scorpiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

scorpion
A venomous arachnid, scorpio: nepa (also as sign of the zodiac: ☞ scorpio likewise for a machine used in war): The sting of a scorpion, ictus scorpionis (the sting as inflicted): plaga scorpionis (wound made by the sting).
A kind of fish, *cottus scorpio (Linn.).
By metonymy, A scourge, scorpio (inasmuch as it had iron stings to it; Vid: Isidorus, Orig., 5, 27, no. 18).

Quick answer

What is the Latin word for scorpion?
The usual Latin words for “scorpion” are scorpiō, nepa, Īsidōrus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.