Yes, cosec is in the scrabble dictionary

...and is worth 11 points by itself.

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Cosec Definition

An abbreviation of cosecant.
from The Century Dictionary and Cyclopedia

residual

Cosecant.
from Free Scrabble Dictionary

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Top Words by points

Points

cosec

9

2 letter words with COSEC

Points

es

2

oe

2

os

2

so

2

3 letter words with COSEC

Points

cos

5

eco

5

oes

3

ose

3

sec

5

soc

5

4 letter words with COSEC

Points

ecos

6

5 letter words with COSEC

Points

cosec

9

secco

9

Found 13 words in 0.12819 seconds