Abhāva (absence) of the Sādhana (proban or middle term) due to the absence of the Sādhya (probandum or major term), e.g., the absence of smoke in the absence of fire.
asati sādhye hetoranupapattirevānyathānupapattiḥ.
asatyanupapatteḥ-asati kṛśānumattve dhūmavattvasyānupapatteḥ.
(Pranata 3.30,31)