| cast iron | 18 |
| wrought iron | 17 |
| pig iron | 11 |
| heme iron | 8 |
| pure iron | 6 |
| elemental iron | 4 |
| dietary iron | 3 |
| nonheme iron | 3 |
| ductile iron | 1 |
| become like chaff | 0.67 |
| react with oxygen | 0.54 |
| do the job | 0.54 |
| make red blood cells | 0.53 |
| enter the body | 0.52 |
| play key role | 0.50 |
| work with tap water | 0.49 |
| make hemoglobin | 0.47 |
| occur in groundwater | 0.45 |
| accumulate in the liver | 0.45 |
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| constipation | 0.45 |
| nausea | 0.31 |
| oxidative stress | 0.30 |
| damage | 0.29 |
| vomiting | 0.29 |
| death | 0.25 |
| diarrhea | 0.23 |
| cirrhosis | 0.23 |
| irritation | 0.16 |
| a 2-inch diameter | 0.43 |
| several vital functions | 0.43 |
| an indicator light | 0.42 |
| a steam function | 0.40 |
| an on/off setting | 0.38 |
| many uses | 0.36 |
| dial | 0.34 |
| ore | 0.32 |
| less than 2% of carbon | 0.30 |
| lustrous grayish metall… | 0.29 |
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| heart disease | 0.28 |
| anemia | 0.26 |
| discoloured water | 0.26 |
| confidence inspiring to… | 0.25 |
| faster ball speed | 0.23 |
| abdominal pain | 0.22 |
| higher launch | 0.18 |
| mineral | 0.59 |
| element | 0.58 |
| essential mineral | 0.57 |
| metallic chemical eleme… | 0.54 |
| important mineral | 0.54 |
| essential element | 0.52 |
| metal | 0.49 |
| a chemical element | 0.47 |
| the fourth most abundan… | 0.46 |
| a trace mineral | 0.44 |
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| iron ore | 0.47 |
| stainless steel | 0.47 |
| heavier tubing | 0.41 |
| solid hand forgings | 0.41 |
| iron and steel scrap | 0.40 |
| steel | 0.40 |
| wood | 0.38 |
| coal | 0.37 |
| pet bones | 0.27 |
| connective cells-- | 0.27 |
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| hemoglobin | 0.60 |
| key enzyme systems | 0.43 |
| extracted | 0.66 |
| absorbed by the body | 0.65 |
| oxidized | 0.64 |
| removed | 0.64 |
| needed by the body | 0.62 |
| stored in the body | 0.62 |
| released | 0.61 |
| used to make steel | 0.59 |
| extracted in a blast fu… | 0.58 |
| stored in the liver | 0.56 |
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| tool | 0.50 |
| decoration | 0.25 |
| desulfurization | 0.25 |