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Definition of Kay
1. Proper noun. (surname from=Middle English dot=) derived from several Old and Middle English words; also adopted by immigrants whose surnames began with a K. ¹
2. Proper noun. (given name male from=Welsh) derived from the surnames, or from a rare medieval given name ( as the Sir Kay of Arthurian legend ), Welsh ''Cai'', Latinized as Caius, related to the modern male name Kai. ¹
3. Proper noun. A short form of Katherine and other female names beginning with a "K"; popular as a middle name. ¹
4. Noun. (Latn-def en name K k) ¹
5. Noun. (colloquial) (abbreviation of okay) ¹
6. Noun. (colloquial) A kilometer. ¹
¹ Source: wiktionary.com
Definition of Kay
1. the letter K [n KAYS]
Medical Definition of Kay
1. Herbert D., British biochemist, *1893. See: Jenner-Kay unit. (05 Mar 2000)