fitz noun. [fɪts] obsolete exc. Hist. ME.
[Anglo-Norman spelling of Old French fiz, earlier filz (mod. fils), from Latin filius son.]
A son. Chiefly in patronymic designations, surviving as an elem. in surnames, e.g. Fitzherbert, Fitzwilliam, latterly sometimes bestowed on the illegitimate sons of princes.
■ J. West The contentions of Henry Fitz-empress with Eleanora of Guienne.

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