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millibarn
millibarn n.
Brit. 
/ˈmɪlɪbɑːn/
, /ˈmɪlɪbɑːn/U.S. /ˈmɪləˌbɑrn/
/ˈmɪləˌbɑrn/ΚΠ
1955 Physical Rev. 97 88 The cross section..has been calculated to be approximately 35 millibarns.
1958 O. R. Frisch Nucl. Handbk. i. 12 Nuclear cross sections are usually expressed in barns or millibarns.
1989 Nature 23 Feb. 718/2 For E = 7 MeV, equation (2) gives σγ,e ≃ 60 millibarn (mb; 1 mb = 10−27 cm2).
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