Figment

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late Middle English (denoting an invented statement or story): from Latin figmentum, related to fingere ‘form, contrive’. Compare with feign and fiction. The current sense dates from the early 17th century.

wiktionary

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From Late Latin figmentum(“anything made, a fiction”), from fingō(“make, form, feign”); see fiction, feign.

etymonline

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figment (n.)

early 15c., "something invented or imagined, a myth or fable; deceitful practice; false doctrine," from Latin figmentum "something formed or fashioned, creation," related to figura "shape" (from PIE root *dheigh- "to form, build"). Related: Figmental; figmentary.