mersister

plural mersisters

1. fantasyA sister who is a mermaid.

   Now that the mersisters were gone, that seemed more important than ever.

   2013, Catherine Hapka, Mermaids in the Backyard, Random House, →ISBN, page 75

   2 more examples

   In the 2008 Broadway version of The Little Mermaid, the song, by Alan Menken (music) and Howard Ashman (lyric), was also performed by the mermaids (or mersisters).

   2009, Thomas S. Hischak, Mark A. Robinson, The Disney Song Encyclopedia, The Scarecrow Press, →ISBN, page 40

   Remember, these are the people who kidnapped us and were going to cut out mine^([sic]) and my mersisters' vocal cords!

   2012, Robert E. Thornsberry, The Accidental Mermaid, AuthorHouse, →ISBN, page 206