Where does “rorandus” come from?

rorandus (Latin) comes from Latin roro, from Latin -ō, from Proto-Indo-European -ō — Derives nouns from roots.

Definitions

Ancestry of “rorandus”, step by step

StepLanguageWordMeaning
1LatinroroI cause dew, drip; am moist; I drop, trickle,...
2Latin-ōsuffixed to nouns or adjectives. Originally a-stem nouns. Later extended to nouns with other stems. Forms regular first-conjugation verbs
3Proto-Indo-European-ōDerives nouns from roots
Every word from Proto-Indo-European -ō →Every word from Latin -ō →Every word from Latin roro →