pedigree: [15] Etymologically, pedigree means ‘crane’s-foot’. It comes from Anglo-Norman *pe de gru, pe meaning ‘foot’ (from Latin pēs) and gru ‘crane’ (from Latin grūs). The notion behind the metaphor is that a bird’s foot, with its three splayed-out toes, resembles the branching lines drawn to illustrate a family tree. => crane, geranium[pedigree etymology, pedigree origin, 英语词源]