One-thousandth of a millimeter.
Also called micrometer. A unit of length convenient for describing cellular dimensions; the Greek letter μ is used as its symbol. A micron is equal to 10¯³ mm (millimeter) or 10-* A (Angstroms) or 0.00003937 inch.
One thousandth of a millimeter or one twenty- five thousandth of an inch.
A unit of measurement equal to one-thousandth of a millimeter. Objects of this size can be observed using a standard microscope, while an ultraelectronic microscope can reveal objects as minuscule as one-millionth of a millimeter.