ThesaurusAntonymsRelated WordsSynonymsLegend:
| Noun | 1. | helium group - the series of inert gasesseries - similar things placed in order or happening one after another; "they were investigating a series of bank robberies" |
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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