In Finnish folklore, Ajatar (also spelled Aiatar, Ajattaro or Ajattara) is a spirit

Spirit

The English word spirit has many differing meanings and connotations, most of them relating to a non-corporeal substance contrasted with the material body.The spirit of a living thing usually refers to or explains its consciousness.The notions of a person's "spirit" and "soul" often also overlap,...

 known as "Devil of the Woods". It is an evil female spirit that manifests as a snake

Snake

Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales...

 or dragon

Dragon

A dragon is a legendary creature, typically with serpentine or reptilian traits, that feature in the myths of many cultures. There are two distinct cultural traditions of dragons: the European dragon, derived from European folk traditions and ultimately related to Greek and Middle Eastern...

. Ajatar is said to be the mother of the devil. She spreads disease and pestilence, any that look at her become ill, and she suckles serpents. Ajatar is related to the Lithuania

Lithuania

Lithuania , officially the Republic of Lithuania is a country in Northern Europe, the biggest of the three Baltic states. It is situated along the southeastern shore of the Baltic Sea, whereby to the west lie Sweden and Denmark...

n Aitvaras

Aitvaras

Aitvaras is a household spirit in Lithuanian mythology. Other names are Kaukas, Pūkis, Damavykas, Sparyžius, Koklikas, Gausinėlis, Žaltvikšas, and Spirukas. Aitvaras is identical to the Latvian Pūkis. An Aitvaras looks like a white or black rooster with a fiery tail . An Aitvaras may hatch from an...

 and the Estonia

Estonia

Estonia , officially the Republic of Estonia , is a state in the Baltic region of Northern Europe. It is bordered to the north by the Gulf of Finland, to the west by the Baltic Sea, to the south by Latvia , and to the east by Lake Peipsi and the Russian Federation . Across the Baltic Sea lies...

n Äi, Äijo or Äijattar. She is in some ways similar to Babylonian Tiamat

Tiamat

In Babylonian mythology, Tiamat is a chaos monster, a primordial goddess of the ocean, mating with Abzû to produce younger gods. It is suggested that there are two parts to the Tiamat mythos, the first in which Tiamat is 'creatrix', through a "Sacred marriage" between salt and fresh water,...

, dragon mother of the gods and goddesses.

The word "ajatar" is possibly derived from the verb ajattaa, "make to pursue", of Finnish

Finnish language

Finnish is the language spoken by the majority of the population in Finland Primarily for use by restaurant menus and by ethnic Finns outside Finland. It is one of the two official languages of Finland and an official minority language in Sweden. In Sweden, both standard Finnish and Meänkieli, a...

word ajaa, "to pursue" (also: "to drive").