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16-gauge

[siks-teen-geyj]
adjective
  1. of, relating to, or being a size of shotgun shell having a diameter of 0.662 inches (1.68 cm).
  2. of, relating to, or being a shotgun using such a shell.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018