Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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actinide series the series of chemical elements, mostly synthetic and all radioactive, that have from eighty-nine to 103 protons per atom.
alkane series the series of saturated hydrocarbons that includes methane and ethane; methane series; paraffin series.
lanthanide series a series of chemical elements having from fifty-seven to seventy-one protons in each nucleus; rare-earth elements.
paraffin series see alkane series.
World Series the annual championship playoff between the winning teams of the two major U.S. baseball leagues.