reniform UK /ˈɹɛnɪfɔːm/US /ˈɹɛnəˌfɔɹm/ adjective2 •Of a leaf: kidney-shaped, with the petiole attached at the notch. •Synonym of kidney-shaped (“having an approximately circular or elongated ovoid shape with an inward curve or indentation on one side”).multiple reniform circumscribed fat-containing masses