mul·ler 
(mŭlər)
(mŭlər)n.
An implement of stone or other hard substance used as a pestle to grind paints or drugs.
[Middle English molour, probably from mullen, to grind; see MULL2.]
- national debt
- national forest
- National Guard
- national income
- nationalism
- nationalist
- nationalistic
- nationalistically
- nationality
- nationalization
- nationalize
- nationalizer
- nationally
- national monument
- national park
- national seashore
- National Socialism
- nationhood
- nationless
- Nation of Islam
- nation-state
- nationwide
- native
- Native Alaskan
- Native American