a chemical group consisting of one hydrogen atom and one oxygen atom; also known as [[氢氧基|氫氧基|qing1 yang3 ji1]]

a highly reactive inorganic compound with the chemical formula NH2OH, used as a reducing agent and in chemical synthesis

paraben; any of a group of compounds used as preservatives in pharmaceutical and cosmetic products

gamma-Hydroxybutyric acid; GHB

hydroxyapatite, a calcium phosphate mineral that is the main inorganic component of bone and teeth

hydroxychloroquine; a medication used to prevent and treat malaria and certain autoimmune diseases

The neutral form of the hydroxide ion, which is a highly reactive chemical species in chemistry

chemical neurotransmitter that sends signals in the brain and nervous system