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 outstretch.

"The blood flows appeared to extend from the wrist to the elbow, which would have been consistent with the outstretching of the arm in crucifixion."

outstretched    outstretches    outstretching   

extend   

etch    fetch    ketch    kvetch    meche   

handsbreadth    euent    catafalque    cartload    grassplot