| 单词 | pith fleck |
| 释义 | > as lemmaspith fleck pith fleck n. a discoloured patch or streak of parenchymatous tissue in wood, usually formed in response to injury by insects. ΘΚΠ society > occupation and work > materials > raw material > wood > [noun] > dark patch pith fleck1890 pith-ray fleck1913 1890 W. Somerville tr. R. Hartig Timbers 77 Pith-flecks, darkish-coloured patches met with in some woods. 1956 F. W. Jane Struct. Wood x. 236 Rotary cut birch..has a most attractive figure, due largely to the very numerous pith flecks which it contains. 1992 Amer. Midland Naturalist 127 9 (caption) Cross section showing insect borings (pith flecks or medullary spots) in the petrified wood. < as lemmas |
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