photosensitize

tr.v., -tized, -tiz·ing, -tiz·es.
To make (an organism, a cell, or a substance) photosensitive.

photosensitizer pho'to·sen'si·tiz'er n.

(fō'tō-sĕn'sĭ-tīz')
v., -tized, -tiz·ing, -tiz·es.

To make an organism, a cell, or a substance photosensitive.

Causing photosensitivity.

• p. plants. — some plants carry primary photodynamic agents, e.g. Hypericum perforatum. Others are hepatotoxic or carry mycotoxin-producing fungi that are, and are indirectly photosensitizing in that they interfere with the excretion of phylloerythrin through the animal's biliary system.

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The verb has one meaning:

Meaning #1: make sensitive to the influence of radiant energy and esp. light, as of an organism or a substance
  Synonym: photosensitise

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