A measurement commonly used to measure the outside diameter of needles, catheters, and other cylindrical medical instruments. One (1) Fr is equivalent to 0.33 mm = .013 = 1/77 of diameter.

Cancer of the lyphoid tissue which includes the lymph nodes, spleen and other organs of the immune system

OSHA Regulation pertaining to Respiratory Protection for healthcare workers listed in the Code of Federal Regulations (CFR)