Antonyms of adj gram-negative

1 sense of gram-negative

Sense 1
Gram-negative -- ((of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's method)

INDIRECT (VIA negative) -> positive, confirming -- (indicating existence or presence of a suspected condition or pathogen; "a positive pregnancy test")

Similarity of adj gram-negative

1 sense of gram-negative

Sense 1
Gram-negative -- ((of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's method)
       => negative (vs. positive), disconfirming -- (not indicating the presence of microorganisms or disease or a specific condition; "the HIV test was negative")