Meanings
nounWratten number (plural Wratten numbers)
plural Wratten numbers
- Any of the arbitrary alphanumeric codes in a system for labelling optical filters, usually for photographic use.
Origin
Named after Frederick Wratten, British inventor who founded the first photography company.
Full word history & related roots →Cite this entry
APA
Wratten number. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/Wratten%20number
MLA
“Wratten number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Wratten%20number. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “Wratten number,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/Wratten%20number.
Source: Wratten number on Wiktionary, CC BY-SA 4.0.