To arrange in rays or radiating lines; to emit rays of light.
From 'en-' prefix plus 'ray' (from Old French 'rai', line of light). An extremely archaic term related to arranging or emitting light in patterns.
This word is so obscure it barely exists in modern English—but it shows how the 'en-' prefix could be attached to almost any noun to create a verb meaning 'put into that form'.
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