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)

(biology, systematics) A group of animals or other organisms derived from a common ancestor species.

* 2001 , Ross H. Nehm, 6: Linking Evolutionary Pattern and Development Process in Marginellid Gastropods'', Alan H. Cheetham, Jeremy B. C. Jackson, Scott Lidgard, Frank K. McKinney (editors), ''Evolutionary Patterns: Growth, Form, and Tempo in the Fossil Record , page 166,

All three clades containing Prunum'' and “''Volvarina ” species contain morphological features that do not collectively appear in any other living or fossil marginellid species (see above).

* 2002 , , page 1092,

No one has ever tabulated the number or percentage of non-trending clades' within larger monophyletic groups. The concept of a non-trending '''clade''' — the higher level analog of a species in stasis — has never been explicitly formulated at all. If only one percent of ' clades exhibited sustained trends, we would still focus our attention upon this tiny minority in telling our favored version of the story of life's history.

* 2004 September 11, Bob Holmes, Linnean naming system faces challengers'', ''New Scientist , page 13,

A clade is made up of an ancestral species and all its descendants; think of it as that part of an evolutionary tree that would fall off with a single saw cut.

(genetics) A higher level grouping of a genetic haplogroup.