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1. A variety of silica that contains microcrystalline quartz.
2. A siliceous rock of chalcedonic or opaline silica occurring in limestone.

[Origin unknown.]

chert′y adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.cherty - resembling or containing chert
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Its mineralogical constitution is not simple; in some parts the rock is of a cherty, in others of a felspathic nature, including thin veins of serpentine.
Tadashi Fukui, Kyoto Sangyo University, and Yasushi Iwamoto, University of Tokyo, "Policy Options for Financing the Future Medical and Long-Term Care Costs in Japan" Discussants: Epictetus Patalinghug and Raj Cherty
Overlying, and in thrust fault contact with, the Rabbitkettle Formation are black shales and black cherty siltstones of the Earn Group (Portrait Lake Formation).
2) shows considerable facies variations both laterally and vertically, encompasses the K-T boundary layer (Bhandari et al., 1994) and consists of interlayered peloidal cherty limestones and shales.
Musical numbers: "Chim Chim Cher-ee," "Cherty Tree Lane," "The Perfect Nanny," "Practically Perfect," "Jolly Holiday," "Being Mrs.
All specimens were found on well-drained, gravelly, acidic soils (28.3% on Baxter-Hammock; 23.5% on Bodine Cherty Silt Loam; 18.3% on Brandon-Saffel; 13.9% on Saffel; 8.3% on Brandon Silt Loam; 5.2% on Guin gravelly loam; 1.7% on Nixa Cherty silt loam and 0.9% on Hammack-Baxter).
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To the south of this lie Silurian graywackes and Devonian sandstones; to the north are Lower Carboniferous dolomite and limestones, often muddy and with shales and cherty horizons.
The potential for water quality degradation from nutrients responsible for eutrophication (N and P), oxygen-demanding materials (organic carbon), and selected metals is of particular interest in areas such as northwest Arkansas where shallow, cherty soils and karstic geology greatly increase the interaction between surface and groundwater.
Agadzhanov, "Osnovnye cherty sistemy upravleniia natsionai "nykh okrain Rossii," in Natsional'nye okrainy Rossiiskoi imperii: Stanovlenie i razvitie sistemy upravleniia, ed.