ὄμβριος
From LSJ
ἀγεωμέτρητος μηδεὶς εἰσίτω → no one ignorant of geometry may enter, let no one ignorant of geometry enter, let no one ignorant of geometry come in
English (LSJ)
ον,
A rainy, of rain, ὄ. ὕδωρ rain-water, Xenoph.30.4, SIG56.29 (Argos, V B.C.), Hdt.2.25, Hp.Aër.7, etc. ; ὕδατα Pi.O.10(11).3 ; χάλαζα S.OC1502 ; νέφος Ar. Nu.288 ; Ζεὺς ὄ., as sender of rain, Lyc.160, cf. Str.15.1.69, Plu.2.158e.