Gram-variable

[ gram-vair-ee-uh-buhl ]
/ ˈgræmˈvɛər i ə bəl /

adjective (often lowercase)

of or relating to bacteria that stain irregularly with Gram's stain, being neither Gram-positive nor Gram-negative.

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Origin of Gram-variable

First recorded in 1955–60; see origin at Gram's method
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021