from huo, "to rain," is used especially, but not entirely, of "showers," and is found in Acts 14:17; 28:2; Hebrews 6:7; James 5:7 (see EARLY and LATTER); 5:18; Revelation 11:6 (see B).
akin to B, below, lit., "a wetting," hence, "rain," is used in Matthew 7:25,27 . In the Sept., Psalm 68:9; 105:32 . It is found in the papyri in connection with irrigation in Egypt (Deissmann, Light from the Ancient East).
akin to A, No. 2, signifies (a) "to wet," Luke 7:38,44 , RV (AV, to wash); (b) "to send rain," Matthew 5:45; to rain, Luke 17:29 (of fire and brimstone); James 5:17 , used impersonally (twice); Revelation 11:6 , where huetos (A, No. 1) is used as the subject, lit., "(that) rain rain (not)."