Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
barn(bărn) [Special use of barn],
A unit of area, employed chiefly in chemistry and physics, approximating the size of the nucleus of a uranium atom. One barn = 10-24 sq cm.
Medical Dictionary, © 2009 Farlex and Partners
BNAbbrev. for Bachelor of Nursing.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005