nixie 1
/nik"see/ , n.
a letter or parcel that is undeliverable by the post office because of a faulty or illegible address.
[ 1880-85; NIX 1 + -IE ]
nixie 2
/nik"see/ , n. Germanic Folklore.
a female water spirit.
[ 1810-20; Nixe (MHG nickese, OHG nicchessa; see NIX 2 ), perh. construed at time of borrowing as NIX 2 + -IE ]