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Yes, sinus is in the scrabble dictionary

...and is worth 7 points by itself.

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Sinus Definition

noun

A depression or cavity formed by a bending or curving.
from The American Heritage Dictionary of the English Language, 4th Edition
Anatomy A dilated channel or receptacle containing chiefly venous blood.
from The American Heritage Dictionary of the English Language, 4th Edition
Anatomy Any of various air-filled cavities in the bones of the skull, especially one communicating with the nostrils.
from The American Heritage Dictionary of the English Language, 4th Edition
Botany A recess or indentation between lobes of a leaf or corolla.
from The American Heritage Dictionary of the English Language, 4th Edition
Pathology A fistula leading from a pus-filled cavity.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points
sinus

5

2 letter words with SINUS

Points

is

2

nu

2

us

2

si

2

un

2

in

2

3 letter words with SINUS

Points

sun

3

uns

3

uni

3

sus

3

sis

3

sin

3

nus

3

ins

3

4 letter words with SINUS

Points

sins

4

suns

4

unis

4

5 letter words with SINUS

Points

sinus

5

nisus

5

Found 19 words in 0.1752 seconds