A "supermassive star" refers to an extremely large and heavy star. It is much bigger and heavier than regular stars found in the universe. Full definition
They may be a new class of midsize black holes, weighing 100 solar masses or so, which could have formed either by the collision of smaller black holes or by the death of supermassive stars. (discovermagazine.com)
Previous studies predicted that when supermassive stars collapse, they maintain a spherical shape that possibly becomes flattened due to rapid rotation. (sciencedaily.com)
The various stages encountered during the collapse of a fragmenting supermassive star. (sciencedaily.com)