burr knot
A knot on a tree caused by root tissue growing in the trunk or a limb; a burl.
plural of ditchdigger
A batten laid lengthwise between two rafters as a bearing for laths laid crosswise. / Any lath laid without actual measurement between two gauged laths.
(US) Initialism of Weather Prediction Center. / Initialism of Wireless Power Consortium.
大工は木材の独特な木目を保つため、その瘤（こぶ）を避けて慎重に作業した。
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