Unscramble Ifndef

What is the meaning of word ifndef unscrambled?

What 6 letter words can be made from letters I F N D E F:

Make more words by adding or removing letters

How many 5 letter words can you make from letters I F N D E F?

1. fiend - Definition of fiend

2. fifed - Definition of fifed

3. fined - Definition of fined

Which 5 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling fndef
2) Removing the letter F and unscrambling indef
3) Removing the letter N and unscrambling ifdef
4) Removing the letter D and unscrambling ifnef
5) Removing the letter E and unscrambling ifndf
6) Removing the letter F and unscrambling ifnde

More anagrams containing the letters I F N D E F
ifndfe ifnedf eiffnd ndeffi