|any of various chemical elements, such as iron, manganese, zinc, copper, and iodine, that occur in very small amounts in organisms and are essential for many physiological and biochemical processes|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a chattering or flighty, light-headed person.|
trace element n.
A chemical element required in minute quantities by an organism to maintain proper physical functioning.
A minute quantity or amount, as of a chemical compound.