"Bulbous shape" refers to something that has a rounded or swollen appearance, similar to the shape of a bulb or a rounded fruit like an onion. Full definition
Bright colors are often combined with bulbous shapes created out of the most bedraggled material. (brooklynrail.org)
In «Skull» (2012), an enormous black bulbous shape covers almost three quarters of the canvas. (brooklynrail.org)
Carrots are here to stay for the season, firmly rooted in the refrigerator drawers with their best friends: potatoes, turnips, parsnips, kohlrabi, beets, celeriac, watermelon radishes and other bulbous shapes that plump up in the dark, loamy depths of the soil while we're feasting on above - ground greens and fruits. (emmafrisch.com)