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shingle

1. (Science: geology) round, water-worn, and loose gravel and pebbles, or a collection of roundish stones, such as are common on the seashore and elsewhere.

2. (Science: botany) Shingle oak, a kind of oak (quercus imbricaria) used in the western states for making shingles.

Origin: Prob. From Norw. Singl, singling, coarse gravel, small round stones.