Obsolescent
Pronunciation : Ob`so*les"cent
Part of Speech : a.
Etymology : [L. obsolescens, -entis, p.pr. of obsolescere, to wear out gradually, to fall into disuse; ob (see Ob-) + solere to use, be wont.]
Definition : Defn: Going out of use; becoming obsolete; passing into desuetude.
Source : Webster's Unabridged Dictionary, 1913