plate holder; cassette; dark slide
Photography term for a light-tight holder used with large-format cameras to hold a photographic plate or film sheet. The glosses 'plate holder', 'cassette', and 'dark slide' refer to the same device or its components.
With a large-format camera, you put a dry plate into the plate holder and take a picture.
Compound of 撮り (tori, 'taking' from 撮る 'to take a photo') and 枠 (waku, 'frame'). The exact historical derivation is uncertain; the term is a technical photography word.