略語大辞典 [Opt] 22 OD optical density 吸光度. 光学濃度. たとえば, ODが3の場合は透過光は1000分の一に減衰する.optical density; a numerical quantity that indicates how much incident lightpasses through a filter; OD = log10 (1/T),where T is the transmittance or the ratioof the transmitted beam intensity to theincident b 丸善「略語大辞典」JLogosID : 11863686