Chalk

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cal·ci·um car·bon·ate

an astringent, an antacid, and a calcium dietary supplement.
See also: calcite.
Synonym(s): chalk, creta
Farlex Partner Medical Dictionary © Farlex 2012
A regional term for any abuse substance consumed as a white powder, e.g., methamphetamine, amphetamine, cocaine
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

cal·ci·um car·bon·ate

(kalsē-ŭm kahrbŏ-nāt)
Astringent, antacid, and dietary supplement.
See also: calcite
Synonym(s): chalk.
Medical Dictionary for the Dental Professions © Farlex 2012
References in classic literature ?
He quickly rubbed out what he had written, gave her the chalk, and stood up.
Dolly was completely comforted in the depression caused by her conversation with Alexey Alexandrovitch when she caught sight of the two figures: Kitty with the chalk in her hand, with a shy and happy smile looking upwards at Levin, and his handsome figure bending over the table with glowing eyes fastened one minute on the table and the next on her.
He snatched the chalk with nervous, trembling fingers, and breaking it, wrote the initial letters of the following phrase, "I have nothing to forget and to forgive; I have never ceased to love you."
She understood it all, and without asking him, "Is it this?" took the chalk and at once answered.
When Cecily had finished and had thrown down the chalk with bitter vehemence, he turned around with a very red face.
Edgware had been a scene of confusion, Chalk Farm a riotous tumult, but this was a whole population in movement.
For instance, the several species of the Chthamalinae (a sub-family of sessile cirripedes) coat the rocks all over the world in infinite numbers: they are all strictly littoral, with the exception of a single Mediterranean species, which inhabits deep water and has been found fossil in Sicily, whereas not one other species has hitherto been found in any tertiary formation: yet it is now known that the genus Chthamalus existed during the chalk period.
4 Once dry, use the chalks to decorate, then fill with goodies.
There isn't any color that I haven't done so far and this is why I was attracted to try hair chalks," said Ashwag Mohammed, a stay-at-home mother.
Make heads turn with the hero of the collection, the limited-edition Hair Chalks. Available in two hair-raising shades: Tickle Me Pink, a playful pink that pops on light-colored hair and Falling For Blue, a bright blue that's electric on brunettes.
The Food and Drug Administration (FDA) has expressed concern over the safety of washable hair chalks being used as hair dye.