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The Collaborative International Dictionary
Residuum

Residuum \Re*sid"u*um\ (-?m), n. [L. See Residue.] That which is left after any process of separation or purification; that which remains after certain specified deductions are made; residue.

``I think so,'' is the whole residuum . . . after evaporating the prodigious pretensions of the zealot demagogue.
--L. Taylor.

Wiktionary
residuum

n. 1 The residue, remainder or rest of something 2 (context chemistry English) The solid material remaining after the liquid in which it was dissolved has been evaporated; a residue. 3 (context fuzzy logic English) A binary function from [0,1] × [0,1] to [0,1] which is defined in terms of the t-norm as follows: x rightarrow y = sup { z | z * x leqslant y}, where * denotes the t-norm function and sup denotes the supremum. 4 (context legal English) The residue of an estate

WordNet
residuum
  1. n. something left after other parts have been taken away; "there was no remainder"; "he threw away the rest"; "he took what he wanted and I got the balance" [syn: remainder, balance, residual, residue, rest]

  2. [also: residua (pl)]

Wikipedia
Residuum (geology)

Residuum is commonly used to refer to the soil and subsoil that forms as the result of long weathering over carbonate rocks ( limestone and dolomite) bedrock. The term is more specific than regolith, which refers to all unconsolidated material, including transported sediments such as sand or alluvium, but less specific than saprolite which commonly refers to weathered material retaining details or structural features of the bedrock. In limestone terrains the boundary between bedrock and residuum is commonly very sharp, but may be highly irregular, defining pinnacles and even isolated blocks of fresh bedrock surrounded by reddish residual silts and clays derived from its decomposition. Resistant materials such as chert, silicified fossils, or beds of sandstone remain and may concentrate on the surface as float.

Usage examples of "residuum".

We do know that the pineal is a residuum of the single eye that our very remote sea-going ancestors had in the center of their fishy foreheads.

Romanae quieti edictali programmate duodecim capitibus sicut jus civile legitur institutum in aevum servanda conscripsimus, quae custodita residuum jus non debilitare, sed potius corroborare videantur.

It is difficult for one not predisposed toward the occult and even strongly prejudiced against it to deny in alleged spiritistic phenomena a challenging residuum which may in the end compel far-reaching modifications in the conclusions both of science and psychology.

The eye is aware of darkness as a base capable of receiving any colour not yet seen against it: so the Mind, putting aside all attributes perceptible to sense--all that corresponds to light--comes upon a residuum which it cannot bring under determination: it is thus in the state of the eye which, when directed towards darkness, has become in some way identical with the object of its spurious vision.

Congress, there is a residuum of power in the state to make laws governing matters of local concern which nevertheless in some measure affect interstate commerce or even, to some extent, regulate it.

But this content is indicated only in a representation that posits itself as such, and that which is signified resides, without residuum and without opacity, within the representation of the sign.

Ina and Anna, the residua of our mistakenly aggressive approach, were still on the ward, slowly returning to their cradling dementia.

No DNA residua, nothing left behind at the scene, not a goddamn thing.

Now the way they solved their riddle was by delegating and giving over jealously specified sovereign powers and doing all that was possible to retain the residuum.

The finest woods make the best fire and pass away with the least residuum.

Elsewhere, in various quarters of the globe, there may be sterile rocks, but there are none so adamant as to be altogether unfurrowed by the filaments engendered in the moist residuum of the condensed vapor.

Dopo un poco potemmo scorgerli, nella scarsa luce residua, correre qua e là torcendosi le mani come in preda alla disperazione, poi tornavano a sedersi nella barca per riposarsi, indi riprendevano a vagare su e giù per la spiaggia.