British spelling of barycenter; the center of mass of an object or system.
Identical in origin to 'barycenter' but follows British spelling conventions using '-tre' instead of '-ter,' a pattern also seen in centre/center and metre/meter.
This spelling difference is purely geographical—British and American scientists studying the exact same physical concept write it differently! It's one of many 're/er' spelling splits that divide English-speaking countries.
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