Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

iodine

play
noun io·dine \ˈī-ə-ˌdīn, -dən, -ˌdēn\

Simple Definition of iodine

  • : a chemical element that is used especially in medicine and photography

Full Definition of iodine

  1. 1 :  a nonmetallic halogen element obtained usually as heavy shining blackish-gray crystals and used especially in medicine, photography, and analysis — see element table

  2. 2 :  a tincture of iodine used especially as a topical antiseptic

Origin of iodine

French iode, from Greek ioeidēs violet colored, from ion violet


First Known Use: 1814


IODINE Defined for Kids

iodine

play
noun io·dine \ˈī-ə-ˌdīn, -dən\

Definition of iodine

  1. 1 :  a chemical element found in seawater and seaweeds and used especially in medicine and photography

  2. 2 :  a solution of iodine in alcohol used to kill germs




Medical Dictionary

noun io·dine \ˈī-ə-ˌdīn, -əd-ən, -ə-ˌdēn\

Medical Definition of iodine

  1. 1:  a nonmetallic halogen element obtained usually as heavy shining blackish gray crystals and used especially in medicine (as in antisepsis and in the treatment of goiter and cretinism) and in photography and chemical analysis—symbol I; see element table

  2. 2:  a tincture of iodine used especially as a topical antiseptic





Seen and Heard

What made you want to look up iodine? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 12, 2016

of, relating to, or suggestive of marble

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

16.96 pounds 196.5 pounds 100 pounds 2.2 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ