oxygen isotope ratio (δ<sup>18</sup>O)
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- an expression for the ratio of the two isotopes 18O to 16O in a sample relative to a standard, defined as: δ18O= (18O/16Osample - 18O/16Ostandard)/ 18O/16Ostandard
NCDC National Climatic Data Center - Cite This Source - This Definition - Atomic weight, half-life, oxygen isotope ratio (\δ\<sup\>18\</sup\>O), radiocarbon (\<sup\>14\</sup\>C), stable isotope