[ gram-vair-ee-uh-buh l ]
/ 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.
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. 2020