Noun

(wikipedia blade) (en noun)

The sharp cutting edge of a knife, chisel, or other tool, a razor blade.

The flat functional end of a propeller, oar, hockey stick, screwdriver, skate, etc.

* {{quote-magazine, year=2013, month=July-August, author= Lee S. Langston, magazine=(American Scientist)

, title= The Adaptable Gas Turbine , passage=Turbines have been around for a long time—windmills and water wheels are early examples. The name comes from the Latin turbo'', meaning ''vortex , and thus the defining property of a turbine is that a fluid or gas turns the blades of a rotor, which is attached to a shaft that can perform useful work.}}

The narrow leaf of a grass or cereal.

(botany) The thin, flat part of a plant leaf, attached to a stem (petiole). The lamina.

A flat bone, especially the shoulder blade.

A cut of beef from near the shoulder blade (part of the chuck).

The flat part of the tongue.

(poetic) A sword or knife.

(archaeology) A piece of prepared, sharp-edged stone, often flint, at least twice as long as it is wide; a long flake of ground-edge stone or knapped vitreous stone.

(ultimate frisbee) A throw characterized by a tight parabolic trajectory due to a steep lateral attitude.

(sailing) The rudder, daggerboard, or centerboard of a vessel.

A bulldozer or surface-grading machine with mechanically adjustable blade that is nominally perpendicular to the forward motion of the vehicle.

(dated) A dashing young man.

* Coleridge

He saw a turnkey in a trice / Fetter a troublesome blade .

(slang, chiefly, US) A homosexual, usually male.

Thin plate, foil.

(architecture, in the plural) The principal rafters of a roof.

(Weale)

The four large shell plates on the sides, and the five large ones of the middle, of the carapace of the sea turtle, which yield the best tortoise shell.

(De Colange)

Airfoil]] in windmills and [[w:windturbine, windturbines.

Noun

(en noun)

A non-existent or empty value or set of values.

Zero]] quantity of [[expression, expressions; nothing.

(Francis Bacon)

Something that has no force or meaning.

(computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.

(computing) the attribute of an entity that has no valid value.

Since no date of birth was entered for the patient, his age is null .

One of the beads in nulled work.

(statistics) null hypothesis