When these extra cells form a mass, it is called a tumor.

Work flour into other ingredients from outside to center, forming a sticky mass.

The American approach would be to assure that there were no containers present in which material could form a critical mass, the experts said.

"But together we form a critical mass and a viable destination."

Space the plants so they will form an impenetrable mass at maturity.

The little particles sinter, which means that they all stick together to form a single mass.

These outlines eventually come together to form a dense mass.

The narrow leaves form a tight mass above ground and spread.

It's important to whisk them together gradually, so that they form a thick, shiny mass.

The eggs have no common envelope and form a loose mass on the water surface or may sink to the bottom.