Look up a word, learn it forever.
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)
atomic number 53
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
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
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
any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic
tincture of iodine
a substance that destroys micro-organisms that carry disease without harming body tissues
(pharmacology) a medicine consisting of an extract in an alcohol solution
Sign up now (it’s free!)
Whether you’re a teacher or a learner, Vocabulary.com can put you or your class on the path to systematic vocabulary improvement.
Play the Challenge
Choose Your Words
Join a Vocabulary Jam
Classroom & Site License
Help Articles / FAQ
Tell us what you think
Team / Jobs
News & Events
Schools & Teachers
Assignments & Activities
Find a List to Learn...
Create a New List...
Words I'm Learning
My Trouble Words
Words I've Mastered