Rights-cleared images from some 40 image collections, including biological and medical collections. Complete metadata, which includes the source, copyright holder, caption, and keywords, is provided for every image.
Ovid has a Multimedia tab, which allows you to browse videos and images across its platform. It also allows Boolean keyword searching of captions in some of its files.
For the latter option: Scroll down Ovid's list of databases and select Books@Ovid or Your Journals@Ovid. Select the Search Fields tab above the search box and change from All Fields to Caption Text. Enter a search string using * for truncation and parentheses to "protect" synonyms, e.g. (hyperlumines* or hyperlucen*). Select Ovid Full Text after a promising citation, examine its figures, and right click to save them.