Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pŏsĭtīvus, a, um, adj. [pono], positive, in gram. 
- I.  Settled by arbitrary appointment or agreement (opp. to natural): nomina non positiva esse sed naturalia, Gell. 10, 4 in lemm.
 
- II.  Positivum nomen. 
 
- 1.  An adjective in the positive degree, Cledon. p. 1893 P.
 
- 2.  A substantive, Macr. S. 1, 4, 9.