English
fatgraph
From fat + graph.
Proto-West Germanic *fait
Proto-West Germanic *faitijan ‘to make fat’
Proto-West Germanic *faitid ‘fatted’
Old English fǣtt ‘fatted’
Middle English fat ‘fattened’
English fat
Today it means
noun A combinatorial object representing the geometry of a protein.
Language periods are conventional ranges, not dates for this word.
Etymograph / fatgraph