from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An atom, radical, or group substituted for another in a chemical compound.
- adj. Of or relating to such an atom or group.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed
from the GNU version of the Collaborative International Dictionary of English
- n. Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
from The Century Dictionary and Cyclopedia
- n. That which substitutes; in chem., an atom or atomic group which takes the place of another atom or group present in the molecule of the original compound. Thus in the compounds methane (CH4) and methyl alcohol (CH3OH), OH is said to be the substituent.
Latin substituēns, substituent-, present participle of substituere, to substitute; see substitute.(American Heritage® Dictionary of the English Language, Fourth Edition)