Definition of chemically in US English:



  • 1In a way that relates to chemistry, or to the interactions of substances as studied in chemistry.

    ‘many of these compounds are chemically reactive’
    • ‘The color pigment and acid chemically react to the metal, creating intense colors.’
    • ‘These bacteria chemically change natural sulfates in water to hydrogen sulfide.’
    • ‘According to our office dictionary, gold is "a soft, dense, yellow, chemically unreactive precious metal."’
    • ‘Each nodule itself is multi-hued, as if layers of chemically variant sediment had created the array.’
    • ‘Hardening is achieved by chemically adding hydrogen to a chain of oil molecules.’
    • ‘Whey proteins that are chemically bound and interacting with starch could reduce the extent of staling during bread storage.’
    • ‘She processes the bags so that the digested plant remains inside can be dried, weighed, and chemically analyzed.’
    • ‘There are import quotas for frozen sweet corn, chemically pure maltose and fructose, pasta, instant soups, and mineral waters.’
    • ‘Molybdenum is an essential component of three enzymes needed to chemically process certain amino acids that we get from protein.’
    • ‘Chiral isomers are chemically similar to one another, but they differ in their biological activity and potency.’
    1. 1.1 By use of chemicals.
      ‘chemically modified vegetable oil’
      ‘her naturally wavy blonde hair was chemically straightened’
      • ‘Enriched or chemically altered waters in harbors are also key areas for consideration.’
      • ‘Many women deal with issues of power and conformity, not to mention chemically taming their hair.’
      • ‘These are chemically treated sponges that can be found at home centers, hardware stores, and janitorial supply stores.’
      • ‘Conventional oil is derived from petroleum refining, whereas synthetic oils are chemically manufactured replicas.’
      • ‘We will modify the pores to control DNA transport and then introduce chemically modified DNA.’
      • ‘For centuries, mercury has been used to chemically separate gold from ore.’
      • ‘A house under attack from termites may be chemically fumigated through a process known as tenting.’
      • ‘In 1999, he developed a way to chemically modify cotton gauze so that it selectively targets and soaks up elastase.’
      • ‘They manufacture chemically etched brass suitable for a myriad of architectural applications.’
      • ‘Synthetic carpets and chemically treated fabrics may release fumes as they age.’
    2. 1.2 Relating to or by means of alcohol or intoxicating drugs.
      ‘a chemically dependent person’
      ‘drugs and alcohol offered a chemically induced sense of belonging’
      • ‘The desire of these heroin addicts for chemically induced oblivion is made comprehensible by the sordid, disaffecting environment in which they live.’
      • ‘She reports that about half of the people with mental illness are chemically addicted.’
      • ‘Sleep is often chemically induced when the effort of trying to achieve those aspirations becomes too much.’
      • ‘These are neurotically emotional outbursts and chemically induced sensations of grandeur and paranoia.’
      • ‘The virus has had a devastating effect among chemically dependent men and women.’
      • ‘Users of this drug fall into a chemically induced serendipity—in love with everyone around them, and clawing at whomever they can reach.’
      • ‘Neurological examination was compromised because the patient was chemically paralyzed.’
      • ‘He goes out looking for drug addicts to kill for their rich, chemically enhanced blood.’
      • ‘As chilly as it is out tonight, I need something to warm me up, both physically and chemically!’
      • ‘When we last heard from them, they were waxing ruefully nostalgic about their chemically wasted youth.’