名詞 blade:

1. especially a leaf of grass or the broad portion of a leaf as distinct from the petiole
   同義詞：leaf blade
2. a dashing young man
3. something long and thin resembling a blade of grass
4. a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard
   同義詞：sword, brand, steel
5. a cut of beef from the shoulder blade
6. a broad flat body part (as of the shoulder or tongue)
7. the part of the skate that slides on the ice
8. flat surface that rotates and pushes against air or water
   同義詞：vane
9. the flat part of a tool or weapon that (usually) has a cutting edge

1. The blade slashed his leg open.
   刀刃把他的腿劃破了。
2. A thin, sharpened side, as of the blade of a cutting instrument.
   利刃一種薄而鋒利的側邊，如切割用具的刀鋒
3. The degree of sharpness of a cutting blade.
   鋒利程度切割刀鋒的鋒利程度
4. The blade is chipped in a few places.
   刀鋒有幾個地方缺口。
5. The blade needs sharpening.
   這刀刃需要磨一磨。

blade

n.（名詞）
The flat-edged cutting part of a sharpened weapon or tool.
刀刃：削磨用的武器或工具的刀口處用來切割的部分

A sword.
劍
A swordsman.
劍手
A dashing youth.
浮蕩少年
A flat, thin part or section:
扁平或薄的部分或一段：
例句：
the blade of an oar; the blade of a food processor.
槳葉；食品加工機葉片

The metal runner of an ice skate.
滑冰鞋金屬冰刀
A wide flat bone or bony part.
一寬而平的骨頭或骨的部分
The flat upper surface of the tongue just behind the tip.
舌面：舌尖后平的上部表面
Botany The expanded part of a leaf or petal. The term is often loosely used to include the entire leaf of grasses and similar plants.
【植物學】 葉片：葉子或花瓣的展開部分。此詞經(jīng)常被不嚴格地用于泛指草和類似植物的葉子總稱

來源：
Middle English
中古英語
from Old English blôd * see bhel- 3
源自 古英語 blôd *參見 bhel- 3

【引伸】
blad.ed
adj.（形容詞）