Frocyte

A frocyte or frosyte (/ˈfroʊ-ˌsaɪt/), also known in Japan as a yuki-onna, is a type of aetherius associated with snow and wintry conditions. While most famous in Japan, they are found in winter belts around the world in both the Southern and Northern hemispheres.

Etymology
The Western name of the aetherius is a portmanteau of the English word "frost" or "frozen," and the Greek ending κύτος (kútos) which meant "vessel." However the word is not pronounced /ˈfroʊ-ˌkaɪt/ and so the term is actually a misnomer, as the commonly derived English translation of the Greek word is the ending "-cyte" which refers to a mature cell in biology; thus "frocyte" would mean "a frozen cell." To avoid this confusion the alternate spelling "frosyte" is sometimes used.

Proposed taxonomy
Frocytes and zephyrs were once considered to be of the same "evolutionary" line as poltergeists because all three were associated with air travel. However, further study of the species indicates that while all three species are considerably developed compared to other aetherii, poltergeists have developed an amoebid, variable anisotropic presence and a loose two-sheet pattern of structure and locomotion. Frocytes and zephyrs appear to have rough specific shapes, and clear movement of energy patterns, so these are no longer part of the Nubem proposed genus.