1911 Encyclopædia Britannica/Averruncator

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AVERRUNCATOR, a form of long shears used in arboriculture for “averruncating” or pruning off the higher branches of trees, &c. The word “averruncate” (from Lat. averruncare, to ward off, remove mischief) glided into meaning to “weed the ground,” “prune vines,” &c., by a supposed derivation from the Lat. ab, off, and eruncare, to weed out, and it was spelt “aberuncate” to suit this; but the New English Dictionary regards such a derivation as impossible.