Dictionary
ob•so•les•cent
Pronunciation: (ob"su-les'unt), [key]—
adj.
1. becoming obsolete; passing out of use, as a word:
an obsolescent term.
2. becoming outdated or outmoded, as machinery or weapons.
3. Biol.gradually disappearing or imperfectly developed, as vestigial organs.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.