# shadowgraph

> English word · Noun

## Definitions
1. A shadow-picture; a radiograph or X-ray photograph; a sciagram.
2. An optical technique of visualizing patterns of fluid flow by using differences in refractive index

## Etymology
From shadow + -graph.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/shadowgraph