i·ron·stone 
(īərn-stōn′)
(īərn-stōn′)n.
1. A hard white pottery.
2. A rock containing enough iron to permit commercial extraction; an iron ore.
- macroevolution
- macroevolutionary
- macrofauna
- macrofaunal
- macrofossil
- macrogamete
- macroglobulin
- macroglobulinemia
- macroglossia
- macrograph
- macrography
- macroinstruction
- macroinvertebrate
- macrolide
- macromere
- macromolecular
- macromolecule
- macron
- macronuclear
- macronucleus
- macronutrient
- macrophage
- macrophagic
- macrophysics
- macrophyte