heat definition In physics, a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat.
Cilia (singular: cilium) are microscopic, hair-like structures that extend outwardfrom the surface of manyanimal cells. These structures are important in the cell cycle and replication, and cilia play a vital part in human and animal development and in everyday life. A typical cilium is between one and ten micrometers long, and usually less than one micrometer wide.
Cilium. Definition. noun, plural: cilia. (biology). Microscopic, hair-like projection on the surfaces of some cells and of certain organisms. (botany). Any of the hair forming a fringe along the margin or edge of a plant structure, e.g. of a leaf. (anatomy).The eyelash.Supplement.efinition. noun, plural: cilia. (biology). Microscopic, hair-like projection on the surfaces of some cells and of certain organisms. (botany). Any of the hair forming a fringe along the margin or edge of a plant structure, e.g. of a leaf. (anatomy). The eyelash. Supplement.