The most essential part; the main idea or substance (of a longer or more complicated matter); the crux of a matter; the pith.
To summarize, to extract and present the most important parts of.
A wheelrim.
An edge around something, especially when circular.
A membrane.
A semicircular copydesk.
To form a rim on.
To roll around a rim.
To lick the anus of a partner as a sexual act.
To follow the contours, possibly creating a circuit.