Angstrom and Metric linear unit

Angstrom noun - A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation.

Metric linear unit and angstrom are semantically related. In some cases you can use "Metric linear unit" instead a noun "Angstrom".

Metric linear unit noun - A linear unit of distance in metric terms.

Angstrom and metric linear unit are semantically related. Sometimes you can replace term "Angstrom" with "Metric linear unit", this terms are similar.