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.
Definition of CILIUM. 1. : a minute short hairlike process often forming part of a fringe; especially: one on a cell that is capable of lashing movement and serves especially in free unicellular organisms to produce locomotion or in higher forms a current of fluid. 2.: eyelash.See cilium defined for kids. ADVERTISEMENT.efinition of CILIUM. 1. : a minute short hairlike process often forming part of a fringe; especially: one on a cell that is capable of lashing movement and serves especially in free unicellular organisms to produce locomotion or in higher forms a current of fluid. 2. : eyelash. See cilium defined for kids.