/uy"euh duyn', -din/ ; in Chem. also /uy"euh deen'/ , n. Chem.
a nonmetallic halogen element occurring at ordinary temperatures as a grayish-black crystalline solid that sublimes to a dense violet vapor when heated: used in medicine as an antiseptic. Symbol: I; at. wt.: 126.904; at. no.: 53; sp. gr.: (solid) 4.93 at 20°C.
Also, iodin /uy"euh din/ .
[ 1814; iode ( iódes, orig. rust-colored, but by folk etym. taken as í ( on ) violet + -odes -ODE 1 ) + -INE 2 ; introduced by H. Davy ]