pro-form 
noun Linguistics
A word or lexical unit which is dependent for its meaning on reference to some other part of the context, for example a pronoun or the verb do in she likes chocolate and so do I.
- ferrihydrite
- ferrimagnet
- ferrimagnetic
- ferrimagnetism
- ferrinatrite
- Ferris wheel
- ferrite
- ferrite core
- ferrite-cored
- ferritic
- ferritin
- ferrivorous
- ferro-
- ferroalloy
- ferroan
- ferrobacterium
- ferro-cement
- ferrocene
- ferrocolumbite
- ferroconcrete
- ferrocyanate
- ferrocyanhydric acid
- ferrocyanic acid
- ferrocyanide
- ferrocyanogen