All on antonyms
on
O o adverb on
- off — so as to be no longer supported or attached: This button is about to come off.
adjective on
- unrewarding — affording satisfaction, valuable experience, or the like; worthwhile.
preposition on
- under — beneath and covered by: under a table; under a tree.
- iron — Chemistry. a ductile, malleable, silver-white metallic element, scarcely known in a pure condition, but much used in its crude or impure carbon-containing forms for making tools, implements, machinery, etc. Symbol: Fe; atomic weight: 55.847; atomic number: 26; specific gravity: 7.86 at 20°C. Compare cast iron, pig iron, steel, wrought iron.