SPF
abbreviation
sun protection factor
Medical Definition
SPF
noun
ˌes-(ˌ)pē-ˈef 
: a number assigned to a sunscreen that is the factor by which the time required for unprotected skin to become sunburned is increased when the sunscreen is used
called also sun protection factor
- a method to one's madness
- a mile a minute
- A minor
- a minore
- a mite
- a monkey on someone's back
- a month of Sundays
- a mug's game
- a nail in someone's coffin
- a nail in the coffin
- a nail in the/someone's coffin
- a name to conjure with
- a nasty piece of work
- a natural death
- a needle in a haystack
- a new lease on life
- a nodding acquaintance
- A number 1
- a number of
- a pack of lies
- a pat on the back
- a peg to hang (something) on
- a peg to hang on
- a peg to hang something on
- a penny for your thoughts