Yes, micro is in the scrabble dictionary

...and is worth 11 points by itself.

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Micro Definition

noun

A microbrew.
from The American Heritage Dictionary of the English Language, 4th Edition
A microbrewery.
from The American Heritage Dictionary of the English Language, 4th Edition
A microcomputer.
from The American Heritage Dictionary of the English Language, 4th Edition
A microprocessor.
from The American Heritage Dictionary of the English Language, 4th Edition

adjective

Very small or microscopic.
from The American Heritage Dictionary of the English Language, 4th Edition
Very small.
from Free Scrabble Dictionary
Involving minute quantities or variations.
from Free Scrabble Dictionary

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Top Words by points

Points

micro

9

2 letter words with MICRO

Points

mi

4

mo

4

or

2

om

4

oi

2

3 letter words with MICRO

Points

mor

5

rom

5

roc

5

rim

5

orc

5

cor

5

moi

5

moc

7

mir

5

mic

7

4 letter words with MICRO

Points

corm

8

coir

6

5 letter words with MICRO

Points

micro

9

Found 18 words in 0.13965 seconds