{"era":"current","word":"wheelchair","meaning":"A chair with wheels, designed for use by people who cannot walk.","children":[{"era":"pre-1100","word":"wheel","meaning":"circular frame, disk","children":[{"era":"pre-500","word":"*hwehwlaz","meaning":"wheel","children":[{"era":"pre-2000 BCE","word":"*kʷekʷlo-","meaning":"wheel, circle","children":[],"language":"Proto-Indo-European"}],"language":"Proto-Germanic"}],"language":"Old English"},{"era":"1200s","word":"chair","meaning":"seat","children":[{"era":"classical","word":"cathedra","meaning":"seat, chair","children":[{"era":"800s BCE","word":"kathédra","meaning":"seat","children":[],"language":"Ancient Greek"}],"language":"Latin"}],"language":"Old French"}],"language":"Modern English"}