melaphyre
/ˈmɛləfʌɪə/(also melaphire, melaphyr) Geology
noun
Any of various dark-coloured porphyritic (especially basaltic) rocks. Later: specifically an altered basalt, especially of Carboniferous or Permian age.
Origin
Early 19th century; earliest use found in Henry Thomas De la Beche (1796–1855), geologist. From French mélaphyre from ancient Greek μέλας black + -phyre (in porphyre).
- for the most part
- for the nonce
- for the pot
- for the present
- for the record
- for the rest
- for the ride
- for the sake of argument
- for the taking
- for the time being
- Forth, Firth of
- forthright
- forthrightly
- forthrightness
- forthwith
- Forties
- fortieth
- fortifiable
- fortification
- fortifier
- fortify
- fortis
- fortissimo
- fortitude
- Fort Knox