photopositive
Concise Oxford English Dictionary © 2008 Oxford University Press:
photopositive/fəʊtəʊˈpɒzɪtɪv/
▶adjective
- 1 Biology (of an organism) tending to move towards light.
- 2 Physics (of a substance) increasing in electrical conductivity under illumination.
'photopositive' also found in these Oxford entries:

