Definition: This is a group of cells with similar structure or function. Example: muscle, connective it says the first to letters are -t-i- :P

Tissue is a group of cells that have similar structure and that function together as a unit. Primary types of body tissues include epithelial, connective, muscular, and nervous tissues. Epithelial tissues form the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands.