{"era":"current","word":"boiler","meaning":"a vessel or machine that boils liquids or generates steam","children":[{"era":"early 13c.","word":"boil","meaning":"to bubble up, be in a state of ebullition","children":[{"era":"12c.","word":"bolir","meaning":"to boil, bubble up, ferment, gush","children":[{"era":"classical","word":"bullire","meaning":"to bubble, seethe","children":[{"era":"prehistoric","word":"*beu-","meaning":"to swell","children":[],"language":"Proto-Indo-European"}],"language":"Latin"}],"language":"Old French"}],"language":"Middle English"}],"language":"Modern English"}