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Meaning of Gram-variable

Gram-var•i•a•ble

Pronunciation: (gram'vâr'ē-u-bul), [key]
— adj.
  1. of or pertaining to bacteria that stain irregularly with Gram's stain, being neither Gram-positive nor Gram-negative.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.