A test result that wrongly indicates the presence of a condition when it is not actually present

a test result that incorrectly indicates that a particular condition or attribute is present

to show a positive result on a medical test

A plant that requires full sunlight to grow well; also called [[喜光植物|喜光植物|xi3 guang1 zhi2 wu4]]

Refers to bacteria that give a positive result in the Gram stain test.