Definition of blade
1 a
:leaf 1a(1);
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: such 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 (such 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
