Where does “gramnegativo” come from?

gramnegativo (Spanish) comes from Spanish negativo, from Latin negativus, from Latin negō, from Latin nec, from Latin neque, from Proto-Indo-European nekʷe, from Proto-Indo-European ne — not.

gramnegativo (Spanish): gram-negative

Definitions

gram-negative

Ancestry of “gramnegativo”, step by step

gramnegativo traces back through two separate lines of ancestry.

via Spanish negativo

Step	Language	Word	Meaning
1	Spanish	negativo	negative; minus sign
2	Latin	negativus	denied, negative, that which denies; inhibiting
3	Latin	negō	to deny
4	Latin	nec	nor; and not, not; neither
5	Latin	neque	not; and not, also not
6	Proto-Indo-European	nekʷe	and not, neither, nor
7	Proto-Indo-European	ne	not

via Spanish tinción de Gram

Step	Language	Word	Meaning
1	Spanish	tinción de Gram	Gram staining

Every word from Proto-Indo-European ne →Every word from Proto-Indo-European nekʷe →Every word from Latin neque →