grey slag
(US gray slag) Metallurgy (now historical )
noun
A lead-rich residue obtained by a preliminary smelting of lead ore and which is subsequently heated to a higher temperature to give metallic lead.
Origin
Early 19th century; earliest use found in Philosophical Magazine.
- on-air
- on a level with
- Onam
- on and off
- on and on
- on an empty stomach
- on an even keel
- onanism
- onanist
- onanistic
- onanistically
- on a par with
- on a plate
- on approval
- on a promise
- on a roll
- on a (silver) platter
- on a sixpence
- Onassis, Aristotle
- Onassis, Jacqueline Kennedy
- on a string
- on a sudden
- on automatic pilot
- on a wind
- on a wing and a prayer