- beetBeta vulgaris, a plant with a swollen root which is eaten or used to make sugar.
- betaineA sweet, crystalline compound (not an alkaloid), trimethylammoniumacetate, found in sugar beet and similar plants, sometimes used to treat muscular degeneracy; the zwitterion (CH₃)₃N⁺CH₂COO⁻.
- betalainA class of red and yellow indole-derived water-soluble pigments found in beets and other plants of the Caryophyllales and used commercially as coloring agents.