¦fōd.ōˌ adjective
Etymology: phot- + toxic
1. : rendering the skin susceptible to damage (as sunburn or blisters) upon exposure to light and especially ultraviolet light
phototoxic antibiotics
a phototoxic topical agent
2. : induced by a phototoxic substance
a phototoxic response
• pho·to·toxicity "ˌ noun