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tri·fo·cal AHD[trī-fōʹkəl, trīʹfō'-] D.J.[traɪˈfəʊkəl, ˈtraɪˌfəʊ-]K.K.[traɪˈfokəl, ˈtraɪˌfo-]adj.（形容词）- Having three focal lengths.三焦距的：有三个焦距的
- Having one section that corrects for distant vision, a second section that corrects for medium vision, and a third that corrects for near vision, as an eyeglass lens.远中近三用的：具有分别校正近距离视觉、中距离视觉和远距离视觉的三个部件的，如目镜透镜
n.（名词）- A lens having three focal lengths.三焦距透镜
- trifocals Eyeglasses having trifocal lenses. trifocals 有三焦距镜片的眼镜
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