tooth是什么意思_tooth怎么读_中英文释义(含例句用法)

tooth: tooth: [OE] Etymologically, a tooth is an ‘eater’. Its ultimate source is the prehistoric Indo- European base *ed- ‘eat’, which also lies behind English eat and edible. From this was formed the noun *dont-, *dent- ‘tooth’, whose descendants include Latin dēns ‘tooth’ (source of English dentist, indent, trident [16], etc), Greek odón ‘tooth’, (source of English odontology [19]), Welsh dant ‘tooth’, and prehistoric Germanic *tanthuz. This evolved into German zahn, Dutch, Swedish, and Danish tand, and English tooth. A variant of *tanthuz may lie behind English tusk.
=> dentist, eat, edible, indent, odontology, trident, tusk
tooth (n.): Old English toð (plural teð), from Proto-Germanic *tan-thuz (cognates: Old Saxon, Danish, Swedish, Dutch tand, Old Norse tönn, Old Frisian toth, Old High German zand, German Zahn, Gothic tunþus), from PIE *dent- "tooth" (cognates: Sanskrit danta, Greek odontos, Latin dens, Lithuanian dantis, Old Irish det, Welsh dent). Plural form teeth is an instance of i-mutation.

Application to tooth-like parts of other objects (saws, combs, etc.) first recorded 1520s. Tooth and nail as weapons is from 1530s. The tooth-fairy is attested from 1964.

词态变化

复数 teeth;

1. A dentist may decide to extract the tooth to prevent recurrent trouble.: 牙医可能会决定拔掉那颗牙，以免反复发作。

2. When not removed, plaque causes tooth decay and gum disease.: 牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。

cog

tooth to tooth composite error 齿间组合误差

buck tooth 撩牙

crown of tooth 齿顶

cycloid tooth 摆线齿

depression of tooth 牙凹陷

double tooth 复齿锯

front tooth 门齿

gangrenous tooth 坏疽性牙

eye tooth 眼牙

helical tooth 螺旋齿

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