Derivatives of xanthine in which one or more hydrogen atoms have been substituted by methyl groups. The common ones are the trimethylxanthine caffeine and the dimethylxanthines theophylline and theobromine.
Methylxanthines
- KREEP
- KREEP volcanism
- Kregel, Kevin Richard (1956– )
- Kremlin, the
- Kremser equation
- Kreutz sungrazer
- Krevyakinskian
- Krige, Danie Gerhardus (1919–2013)
- kriging
- Krikalev, Sergei Konstantinovich (1957– )
- krill
- Kripke completeness
- Kripke, Saul Aaron (1940– )
- Kripke semantics
- Kristeva, Julia (1941–)
- Kristina Wasa (1626–89)
- Krogh, Schack August Steenberg
- Kroll process
- Kronecker delta
- Kronecker, Leopold
- Kronecker, Leopold (1823–91)
- Kronecker’s Lemma
- Kronig–Penney model
- S Vulpeculae star
- swale