Princeton's WordNet
iodine, iodin, I, atomic number 53(noun)
a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
Synonyms:
tincture of iodine, iodin, unity, single, iodine, atomic number 53, one, ace
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