A clump of things such as trees or plants is a small group of them growing together. ...a sweetly scented perennial that grows in clumps. A clump of things such as wires or hair is a group of them collected together in one place. I was combing my hair and it was just falling out in clumps. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.