Jörmungandr is a giant sea serpent in Norse mythology. Jörmungandr, which is also known as Miðgarðsormr, is the archenemy of Thor. It is one of the children of the giantess Angrboða and the god Loki.
The name Jörmungandr translates to "huge monster", while its other name, Miðgarðsormr, translates to "serpent of Midgard" because the serpent was so large it encircled the whole of the world (Midgard) to the point of reaching its own tail.
The correct pronunciation of Jörmungandr is YOUR-moon-GAHN-dr.
It is essential to note that the first syllable, whose pronunciation is transcribed as -YOUR, is an approximation. This is because there is no equivalent in the English language. In the audio pronunciation, you will hear the inflection in tone when pronouncing the "ö", which gives it a closed quality. It is also important to note that both the first and third syllables are stressed.
The "u" in the second syllable is not pronounce like an English "u", but it is pronounced with an "oo" sound. The "a" in the third syllable is then pronounced as a short "a", so it is pronounced with an "ah" sound.
The final syllable, -dr, is pronounced with a slightly rolling "R" sound.