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Douglas Harper's Etymology Dictionary

"group of organisms evolved from a common ancestor," 1957, from Greek klados "young branch, offshoot of a plant, shoot broken off," from PIE *kele-, possibly from root *kel- (1) "to strike, cut" (see holt).


n. 1 (context biology systematics English) A group of animals or other organisms derived from a common ancestor species. 2 (context genetics English) A higher level grouping of a genetic haplogroup.


n. a group of biological taxa or species that share features inherited from a common ancestor


A clade (from , klados, "branch") is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single "branch" on the " tree of life".

The common ancestor may be an individual, a population, a species ( extinct or extant), and so on right up to a kingdom. Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan").

Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic.

Clade (novel)

Clade is a science fiction novel written by Mark Budz, published in 2003. In Clade, an environmental disaster called the Ecocaust has caused sea levels to rise and causing additional strains on human resources. The government, in response, becomes more restrictive on human freedoms, and this novel explores what happens after the Ecocaust.

Clade (disambiguation)

Clade is a phylogenetic group.

Clade may also refer to:

  • Clade (novel), 2003 science fiction novel by Mark Budz
  • Emil Clade, Luftwaffe flying ace in World War II

Usage examples of "clade".

She had the inhumanly symmetrical features that only a first-line clade could afford to buy for the alpha instances of their phenotype.

She was somewhat relieved to find that a lecture on the credit control implications of time travel was sufficient to hold the rapt if slightly incomprehending attention of the three youth leaders from clade Todt, whatever that was.

It was an instinct of the Well governors to try to push every living thing of every clade toward a harmonious life system, where cooperation carried more value than conflict.

Neutrally Buoyant First Order Ubiquitous Climax Clade Gas-Giant Dwellers, to grant them a still more painfully precise specification - were large creatures of immense age who lived within the deliriously complex and topologically vast civilisation of great antiquity which was distributed throughout the cloud layers wrapping the enormous gas-giant planet, a habitat that was as stupendous in scale as it was changeable in aerography.

Part of an Ubiquitous clade, found wherever Dwellers were, they harvested water condensation out of Dwellerine gas-giant atmospheres, using their dangling, thick and relatively solid roots to exploit the temperature difference between the various atmospheric layers.

Perhaps that proves that some of my progenitors came from the same clade from which some of yours sprang.

We expected that we would have to work with any clade, in any part of the spiral arm.

The principal clade territories of the spiral arm were delineated in their characteristic colors.

Graves made a gesture with his right hand, and the display of the principal clades and neighboring Gulf that Darya had seen the day before appeared.

The Builders operate at such vast levels of thought and technology that assistance from our clades to the Builders will never be necessary.

The contrary hypothesis, namely, that the Builders lack total control over their own works and may require help from clades whom we have previously considered so far beneath them, is close to heretical.

The boundaries that used to exist between clades are gone, and not every species will survive the mixing.

If Captain Rebka were listening, I would say four major clades in deference to his feelings.

Phemus Circle, and found that little cluster of twenty-three suns and sixty-two habitable planets limned in muddy brown, at the point where the overlapping boundaries of the three dominant clades converged.

It was no coincidence that the three major clades had never fought for possession of the Phemus Circle.