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The community needs to be provided with terminology standards in order to achieve interoperability between databases intended for clinical research and including description of phenotypes. This is crucial to interpret genomic rearrangements as well as future high-throughput sequence data. The aim of our work was to promote a core terminology of phenotypes interoperable with all the terminologies in use. Relevant terminologies in use by different communities to describe phenomes were cross–referenced: PhenoDB (2846 terms), London Dysmorphology Database (LDDB; 1318 terms), Orphanet (1243 terms), Human Phenotype Ontology (9895 terms, 22/08/2012), Elements of Morphology (AJMG; 423 terms), ICD10 (1230 terms), as well as medical terminologies in use: UMLS (7,957,179 distinct concept terms), SNOMED CT (>311,000 concepts), MeSH (26,853 concepts) and MedDRA (69,389 concepts). We established a strategy to compare them to find commonalities and differences, using ONAGUI as a tool to pick-up exact matches. The non-exact matches were verified manually by an expert. A core-terminology of 2,300 terms was derived and analysed by a panel of experts (International Consortium for Human Phenotype Terminologies – ICHPT). The resulting consensual terminology will be freely available in a dedicated website (www.ichpt.org) and mappings with other terminologies will be given in order to ease the interoperability between databases without disturbing the habits of the different groups of users.