The poetic meter called dróttkvætt:

Two units of four lines each.

Each line has six syllables, three of them stressed.

In each line, the last two syllables are: stressed then unstressed.

In each line, the first four syllables: stress placement doesn't matter.

Each odd-numbered line has a full rhyme occurring.

Each even-numbered line has a half or full rhyme occurring.

Couplets: pairing of odd and even-numbered lines: 1+2, 3+4, 5+6, 7+8

In each couplet, the odd-numbered line has two alliterating syllables, which continue by alliterating with the first syllable of the even-numbered line.

Use of kennings and rhymes.

Example (by Joyce Holt):

1. Woe, the meadow's master:
2. mighty, tall, soon fallen
3. when winter winds batter.
4. Wit calls for roots knit well.

5. Weaklings seeking shelter,
6. side by side, toes entwined,
7. outlast their master's life,
8. leaning all together.

The last few lines don't fully adhere to the pattern.

(Accented syllables: in bold)

Alliteration in lines 1 and 2: meadow+master+might

Alliteration in lines 3 and 4: winter+winds+wit

Rhyme in line 1: woe+meadow

Rhyme in line 2: tall+fallen

Half-rhyme in line 4: calls+well

Kenning: Meadow's master: a tall lone tree, exposed to the weather

Definitions:

alliteration:
-- two or more words beginning with the same or similar consonant, as in "bed and breakfast"
-- two or more words beginning with any stressed vowel, as in "each and all"...where "each" and "all" are stressed but "and" is not

rhyme:
-- words whose last vowels sound the same, along with any consonants following those ending vowels, as in "who, true" or "hat, cat" or "mention, intention"

half-rhyme:
-- words whose ending consonants sound the same (though not the last vowels) as in "big, leg, tug"

partial rhyme:
-- words whose last vowels sound the same (though not the final consonants) as in "last man standing"

kenning:
-- a riddling choice of words ("whale's road" means the ocean)