Submitted by György Chityil ... on Fri, 01/19/2018 - 23:58 Hierarchy: NounDescription: {{context|geology}} A type of contact twins where the composition surfaces are parallel to one another.Ngram: polysynthetic twinningNgram Text: polysynthetic twinningSource: WiktionaryIssue: 0Wiktionary tag: geologyNgram Count: 2