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(US), luster
a. a shiny metallic surface on some pottery and porcelain
b. (as modifier): lustre decoration
2. Mineralogy the way in which light is reflected from the surface of a mineral. It is one of the properties by which minerals are defined


(A French acronym for Synchronous real-time Lucid). Real-time dataflow language for synchronous systems, especially automatic control and signal processing. A Lucid subset, plus timing operators and user-defined clocks.

Designed for automatic control applications. It is based on the idea that automatic control engineers use to analyse, and specify their systems in terms of functions over sequences (sampled signals). It thus seems both safe and cost effective to try to compile directly those descriptions into executable code. A lot of work has been done, so as to get efficient compilation, and also in formal verification. The language has been used in nuclear plant control, and will be used in aircraft control.

["Outline of a Real-Time Data-Flow Language", J.-L. Bergerand et al, Proc IEE-CS Real Time Systems Symp, San Diego, IEEE Dec 1985, pp. 33-42].

["LUSTRE: A Declarative Language for Programming Synchronous Systems", P. Caspi et al, Conf Rec 14th Ann ACM Symp on Princ Prog Langs, 1987].
References in classic literature ?
The skinny hands were clasped upon the breast; two lustreless tufts of hair stuck to the skull; the skin was brown and sunken; it stretched tightly over the cheek bones and made them stand out sharply; the crisp dead eyes were deep in the sockets; the nostrils were painfully prominent, the end of the nose being gone; the lips had shriveled away from the yellow teeth: and brought down to us through the circling years, and petrified there, was a weird laugh a full century old!
He sat, however, staring vacantly at the floor; with a lustreless and stupid smile.
a pale face, lustreless gray eyes, a metallic voice, and a languid manner.
Why, he was literally skin and bone, and his fur was dull and lustreless.
replied the baron, nothing daunted by his hollow voice and lustreless eyes.
I never 'ad none," was the Cockney's comment, as he gazed with lustreless, hopeless eyes into mine.
She had lapsed into these inquiries, but next moment she saved the consistency of her conduct by resuming her dusting, while the old woman sat scared and dumb under her dingy white cap and lustreless dark wig.
Those widely staring eyes, so lustreless and so glassy, that he had better borne to see them than think upon them, appeared in the midst of the darkness: light in themselves, but giving light to nothing.
He was staring hard at the stranger, and though his eyes were lustreless and heavy at first, they appeared to glow with an unnatural and alarmed expression after they had been fixed upon him for a short time, until they seemed to be starting from their sockets.
There was a gleam of fire in his lustreless eyes; he seemed to be glad to think that he was still proud.
On the lake of lustreless living, is the segment of retirement and solitude.
They and DR Congo will now both be hoping bottom side Togo can cause an upset in their game with the Indomitable Lions on Sunday, to prevent the leaders putting three points between them and the chasing pack Libya, playing their first international competitive match for 32 months in front of a home crowd, were the better team for most of the game, but they did not raise their game enough to lead to a win in a lustreless match that surprisingly did not attract the attendance one would have anticipated.