reni

noun

1. Gui·do [gwee-daw] /ˈgwi dɔ/, 1575–1642, Italian painter.

1. a combining form meaning “kidney,” used in the formation of compound words: reniform.

noun

1. Guido (ˈɡwiːdo). 1575–1642, Italian baroque painter and engraver

combining form

1. kidney or kidneysreniform