| 单词 | punk knot |
| 释义 | > as lemmaspunk knot punk knot n. a protuberance in wood indicating internal decay. ΘΚΠ the world > plants > disease or injury > [noun] > type of disease > fungal > associated with trees > fungal excrescence punk knot1838 cedar apple1849 1838 Amer. Jrnl. Sci. 34 174 And hence the origin of what the carpenters call punk knots, that so often appear in our most valuable white pine mast sticks. 1906 H. S. Graves Forest Mensuration 207 Usually decay manifests itself by some external sign, such as punk knots, white resin, unhealthy crown.., and so on. 1944 Forestry Terminol. (Soc. Amer. Foresters) 42/2 Swollen [knot], an open punk knot with surrounding tissues abnormally protruded as a result of attempted callusing; particularly common to Douglas fir affected with the red ring-rot fungus, Fomes pini. < as lemmas |
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