coring

Pluralcorings (some meanings)

1. 1
   verb

   Present participle and gerund of core.

   The chef stood at the counter coring a basket of apples.

   Coring the strawberries by hand took most of the afternoon.

   Note

   One spelling does two grammatical jobs. In she was coring apples it carries the progressive, and in coring strawberries is slow work it acts as a noun. It follows core through all its verb uses: hollowing out fruit, cutting through the middle of something, and drawing up a sample with a drill. The last of these also stands as the drilling noun. The mathematical coring is a separate word, co- plus ring, that only shares the letters.

2. 2
   noununcountable

   The making of a core by drilling into rock, ice, or other solid material.

   Like an apple corer cutting a clean cylinder, scaled up to drill through rock or ice.

   Deep-sea coring brought up sediment that recorded thousands of years of climate.

   The geologists scheduled coring at three sites along the fault line.

   Similardrilling, sampling

3. 3
   nouncountable

   The algebraic structure dual to a ring, obtained by reversing its defining operations.

   Her thesis studies comodules over a coring rather than modules over a ring.

   Every extension of rings gives rise to a canonical coring.

   Note

   Algebra names its duals with co-, and this word follows that habit: co- plus ring, as coalgebra stands beside algebra. Over a ring A, the structure is an A-bimodule with a comultiplication into its tensor square over A and a counit. Coalgebras are the special case where A is commutative and its two actions agree. In this sense the word is countable, and its plural is corings.

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