Definition of terpenoid in English:



  • Any of a large class of organic compounds including terpenes, diterpenes, and sesquiterpenes. They have unsaturated molecules composed of linked isoprene units, generally having the formula (C₅H₈)n.

    • ‘Agents used in household cleaning compositions are composed of structurally diverse classes of chemicals, including surface active agents, phenols, and terpenoids.’
    • ‘However, the vast majority of terpenoids are classified as secondary metabolites, compounds not required for plant growth and development but presumed to have an ecological function in communication or defense.’
    • ‘The nectar is sucrose-dominant but also contains low concentrations of glucose, fructose, free amino acids and possibly terpenoids.’
    • ‘Because these terpenoids contain many functional groups - mainly unsaturated and saturated aldehydes and ketones - how they exert their antimicrobial activity is not well understood.’
    • ‘Many species endemic in Australia are known to synthesize and accumulate significant quantities of volatile terpenoids.’


  • Denoting terpenoid compounds.

    • ‘Several other terpenoid compounds have been detected in the plant; some of these have been isolated and structurally characterized.’
    • ‘Bursera species often produce complex mixtures containing many individual compounds, often belonging to several terpenoid types.’
    • ‘In other plant-herbivore systems, the physical properties of the resins are determined by their terpenoid composition.’
    • ‘The genus is notable for its terpenoid secretions and exudates that arise from a system of arborescent resin canals.’
    • ‘Tobacco was used as the host plant because it is an appropriate host for genetic engineering and its endogenous terpenoid metabolism has been well studied.’