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r-unit ['ɑ:'ju:nɪt]
nucl.phys., unit.meas. röntgen; unité r
 English thesaurus
r-unit ['ɑ:'ju:nɪt]
abbr., earth.sc. roentgen unit
R-unit ['ɑ:'ju:nɪt]
abbr., med. roentgen
r-unit: 3 phrases in 1 subject
Nuclear physics3