The Collaborative International Dictionary of English v.0.48:
Alkalescent \Al`ka*les"cent\, a. [Cf. F. alcalescent.] Tending to the properties of an alkali; slightly alkaline. [1913 Webster]WordNet (r) 3.0 (2006):
alkalescent adj 1: tending to become alkaline; slightly alkaline [syn: alkalescent, alcalescent]