Etymology
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stavesacre (n.)
herbal plant of the Delphinium family, c. 1400, from Latin staphisagria, from Greek staphis agria, literally "wild raisin," from staphis "raisin" (according to Klein, probably related to staphyle "bunch of grapes") + agria, fem. of agrios "wild," literally "living in the fields," from agros "field" (from PIE root *agro- "field").
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*agro- 
Proto-Indo-European root meaning "field;" probably a derivative of root *ag- "to drive, draw out or forth, move."

It forms all or part of: acorn; acre; agrarian; agriculture; agriology; agro-; agronomy; onager; peregrinate; peregrination; peregrine; pilgrim; stavesacre.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit ajras "plain, open country," Greek agros "field," Latin ager (genitive agri) "a field," Gothic akrs, Old English æcer "field."
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