clot

a flat, wet clot of dead leaves.

Milk clots when it turns sour.

"You've broken that dish, you clot!"

a clot of automobiles blocking the tunnel's entrance.

When you cut yourself, blood clots and forms a scab.

A year ago he had a blood clot removed from his brain.

At highest field strengths, the core of the clot may have low signal on T2-weighted images, due to the presence of intracellular methemoglobin or of deoxyhemoglobin.