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Yes, penicillin is playable

...and is worth 20 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Penicillin" Definition

noun

Any of a group of broad-spectrum antibiotic drugs obtained from penicillium molds or produced synthetically, most active against gram-positive bacteria and used in the treatment of various infections and diseases.
Any of several relatively nontoxic antibiotic acids of the general formula CHNOSR that are produced by molds (genus and especially or ) or synthetically and are used especially against gram-positive cocci.
A mixture of such acids.
A salt or ester of a penicillin or a mixture of such salts or esters.

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