Yes, tetrad is in the scrabble dictionary

...and is worth 7 points by itself.

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Tetrad Definition

noun

A group or set of four.
from The American Heritage Dictionary of the English Language, 4th Edition
A tetravalent atom, radical, or element.
from The American Heritage Dictionary of the English Language, 4th Edition
Biology A four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.
from The American Heritage Dictionary of the English Language, 4th Edition
Botany Biology A group of four cells, as of spores or pollen grains, formed by division of one mother cell.
from The American Heritage Dictionary of the English Language, 4th Edition
a group or arrangement of four as.
from Free Scrabble Dictionary

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Top Words by points

Points

ratted

7

2 letter words with TETRAD

Points

ae

2

ar

2

at

2

re

2

et

2

er

2

da

3

de

3

ed

3

te

2

ta

2

ad

3

3 letter words with TETRAD

Points

eta

3

ret

3

rad

4

rat

3

red

4

tad

4

tae

3

tar

3

tat

3

tea

3

ted

4

tet

3

eat

3

are

3

art

3

ate

3

att

3

era

3

ear

3

4 letter words with TETRAD

Points

rate

4

tret

4

trad

5

teat

4

tear

4

tate

4

tart

4

tare

4

dare

5

dart

5

date

5

dear

5

read

5

drat

5

5 letter words with TETRAD

Points

derat

6

treat

5

tread

6

trade

6

tetra

5

tater

5

tared

6

rated

6

atted

6

dater

6

6 letter words with TETRAD

Points

ratted

7

tarted

7

tetrad

7

Found 58 words in 0.16935 seconds