Melting point - Mill run
- Melting point
- Melting pot
- Melting zone
- Melting [remelting] furnace
- Member
- Membership card
- Membrane
- Membrane (touch) switch
- Memo(randum)
- Memo(randum) book
- Memo(randum) pad
- Memorial data calendar
- Memorial publication
- Memory bank
- Memory device
- Memory system
- Mending
- Menu
- Menu bar
- Menu-driven
- Menu-driven page composition
- Menu-driven page composition system
- Merchandising
- Merchandize catalog(ue)
- Merchant
- Mercuriographic printing
- Mercury
- Mercury (vapour) lamp
- Mercury discharge [mercury vapor] lamp
- Mercury lamp
- Mercury lighting
- Mercury vapor
- Merged dots
- Merging
- Mesh
- Mesh adhesive
- Mesh count
- Mesh distortion
- Mesh opening
- Mesh stretcher