frame grab1
noun
A still image obtained by capturing a single frame of a television picture, film, or video sequence, typically in digital form; a function or device allowing such images to be captured.
Origin
1970s; earliest use found in U.S. Patents.
frame-grab2
verb
[with object] To obtain (a frame grab) from a television picture, film, or video sequence.
Origin
1970s; earliest use found in Electronic Design.