This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of prepare.

"But if it's for "a picture book" then many minds are involved -- artist, writer, editor, designer -- to an extent that I would venture exceeds the similarly creative collaboration involved in preparing a words-only manuscript for publication."

prepared    prepares    preparing   

sound   

prepared trill   

provide    preparation    framed    fit    bound   

Adair    Aer    Altair    Astaire    Ayre   

canned    kosher    leftover    Worcestershire    uncooked