Yes, attenuate is playable
...and is worth 11 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Attenuate" Definition
adjective
Botany Gradually tapering to a slender point.
Reduced or weakened, as in strength, value, or virulence.
Reduced especially in thickness, density, or force.
Tapering gradually usually to a long slender point.
Reduced in force, effect, or physical thickness:.
verb-intransitive
To become thin, weak, or fine.
verb
To make thin in consistency.
To lessen the amount, force, magnitude, or value of.
To reduce the severity, virulence, or vitality of.
To become thin, fine, or less.
verb-transitive
Biology To make (bacteria or viruses) less virulent.
Electronics To reduce (the amplitude of an electrical signal) with little or no distortion.
To lessen the density of; rarefy.
To make slender, fine, or small: The drought attenuated the river to a narrow channel.
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