Definition of "lobing"

The decoration found on the stems are perpendicular ribbings, ordinary rounded mouldings, and perpendicular lobings.

1919, MacIver Percival, The Glass Collector: A Guide to Old English Glass, page 31

Nevertheless there are curious points to be investigated in the earlier stages of development, such as the vascular supply and the chalazal lobings.

1976, Edred John Henry Corner, The Seeds of Dicotyledons, page 119