Ŏb'so-lĕs'cent, a.

a. [Lat. obsolescens, p. pr. of obsolescere, obsoletum, to wear out gradually, to fall into disuse, from prefix ob and solere, to use, be wont.] Going out of use; passing into desuetude.

All the words compounded of “here” and a preposition, except “hereafter,” are obsolete or obsolescent. Campbell.