A record or image produced by the action of radiation or light on a photographic or sensitive surface, similar to a photograph but specifically emphasizing the radiant energy component.
From actino- (Greek aktis, 'ray') + gram (from Greek gramma, 'writing' or 'record'). Emerged in early 20th-century scientific imaging as researchers distinguished between different types of radiant recordings.
Actinograms were the bridge between traditional photography and X-ray imaging—scientists realized they could use the invisible energy in ultraviolet and X-rays to create images, founding the entire field of radiography that saves lives in hospitals every day.
Complete word intelligence in one call. Free tier — 50 lookups/day.