Unscramble Ifdef

What is the meaning of word ifdef unscrambled?

What 5 letter words can be made from letters I F D E F:

1. fifed - Definition of fifed

Make more words by adding or removing letters

How many 4 letter words can you make from letters I F D E F?

1. defi - Definition of defi

2. diff - Definition of diff

3. fief - Definition of fief

4. fife - Definition of fife

Which 4 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling fdef
2) Removing the letter F and unscrambling idef
3) Removing the letter D and unscrambling ifef
4) Removing the letter E and unscrambling ifdf
5) Removing the letter F and unscrambling ifde

More anagrams containing the letters I F D E F
ifdfe ifedf fefid deffi