atomic number 53

Noun
  1. 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) (synset 114665575)
    is a type of:
    • chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
    • halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
    subtypes:
    • iodine-131 - heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter
    • iodine-125 - light radioactive isotope of iodine with a half-life of 60 days; used as a tracer in thyroid studies and as a treatment for hyperthyroidism
    substance meronym: brine, saltwater, seawater - water containing salts
    same as: i, iodin, iodine

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