crotalin

[kroht-l-in]

cro·ta·lin

[kroht-l-in]
noun Biochemistry.
a protein in the venom of pit vipers, used as an antigen in the preparation of snake antivenins.

Origin:
< Neo-Latin Crotal(us) a genus of rattlesnakes, from whose venom the protein was extracted (< Latin crotalum < Greek krótalon rattle) + -in2
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Crotalin is always a great word to know.
So is argon. Does it mean:
Symbol: Xe; atomic weight: 131.30; atomic number: 54
Symbol: Ar; atomic weight: 39.948; atomic number: 18
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