Unscramble Iststring

What is the meaning of word iststring unscrambled?

What 9 letter words can be made from letters I S T S T R I N G:

Make more words by adding or removing letters

How many 8 letter words can you make from letters I S T S T R I N G?

1. sittings - Definition of sittings

Which 8 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling ststring
2) Removing the letter S and unscrambling itstring
3) Removing the letter T and unscrambling isstring
4) Removing the letter S and unscrambling isttring
5) Removing the letter T and unscrambling istsring
6) Removing the letter R and unscrambling iststing
7) Removing the letter I and unscrambling iststrng
8) Removing the letter N and unscrambling iststrig
9) Removing the letter G and unscrambling iststrin

More anagrams containing the letters I S T S T R I N G
iststrngi iststrnig ttsirisgn gitsrsnti