Entry 3 senses · 2 variants Webster, 1913 Pluvial · Plu·vi·al · IPA /ˈplu.vi.əl/ a. n. 01 a. Of or pertaining to rain; rainy. 1. Of or pertaining to rain; rainy.[R.] 2. Produced by the action of rain.(Geol.) 02 n. A priest's cope. 1. A priest's cope.