I) expanded body of a leaf. 2) sharp. cutting part of a tool.

Merriam-Webster Online Dictionary
blade (noun)
1.
a) - leaf , especially the leaf of an herb or a grass
b) the flat expanded part of a leaf as distinguished from the petiole
2.
something resembling the blade of a leaf as
a) the broad flattened part of an oar or paddle
b) an arm of a screw propeller, electric fan, or steam turbine
c) the broad flat or concave part of a machine (as a bulldozer or snowplow) that comes into contact with the material to be moved
d) a broad flat body part , specifically - scapula used chiefly in naming cuts of meat
e) the flat portion of the tongue immediately behind the tip , also this portion together with the tip
3.
a) the cutting part of an implement
b) (1) - sword
(2) - swordsman
(3) a dashing lively man
c) the runner of an ice skate
blade (verb)
intransitive verb
to skate on in-line skates
blade (Wikipedia)

A blade is the portion of a tool, weapon, or machine with an edge that is designed to puncture, chop, slice or scrape surfaces or materials. Blades are typically made from materials that are harder than those they are to be used on. Historically, humans have made blades from flaking stones such as flint or obsidian, and from various metal such as copper, bronze and iron. Modern blades are often made of steel or ceramic. Blades are one of humanity's oldest tools, and continue to be used for combat, food preparation, and other purposes.

Blades work by concentrating force on the cutting edge. Certain blades, such as those used on bread knives or saws, are serrated, further concentrating force on the point of each tooth.

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