phototoxin

[foh-tuh-tok-sin]

pho·to·tox·in

[foh-tuh-tok-sin]
noun
Biochemistry. a plant toxin causing an allergic reaction when touched or eaten by a susceptible person or animal subsequently exposed to sunlight.

Origin:
photo- + toxin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Phototoxin is always a great word to know.
So is lanthanum. Does it mean:
Symbol: Ru; atomic weight: 101.07; atomic number: 44
Symbol: La; atomic weight: 138.91; atomic number: 57
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