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WordReference Random House Learner's Dictionary of American English © 2016
phys•ics /ˈfɪzɪks/USA pronunciation   n. [uncountable; used with a singular verb]
  1. Physicsthe science that deals with matter, energy, motion, and force:Physics is what seems to have interested him the most.
phys•i•cist /ˈfɪzəsɪst/USA pronunciation  n. [countable]See -phys-.

WordReference Random House Unabridged Dictionary of American English © 2016
phys•ics  (fiziks),USA pronunciation n. (used with a sing. v.)
  1. Physicsthe science that deals with matter, energy, motion, and force.
  • see physic, -ics 1580–90

WordReference Random House Unabridged Dictionary of American English © 2016
phys•ic  (fizik),USA pronunciation n., v.,  -icked, -ick•ing. 
  1. Drugsa medicine that purges;
  2. Drugsany medicine;
    a drug or medicament.
  3. Drugs[Archaic.]the medical art or profession.
  4. Drugs[Obs.]See  natural science. 

  1. Drugsto treat with or act upon as a physic or medicine.
  2. Drugsto work upon as a medicine does;
    relieve or cure.
  • Greek physiké̄ science of nature, noun, nominal use of feminine adjective, adjectival: pertaining to nature (akin to phŷlon tribe, phylon); (verb, verbal) Middle English, derivative of the noun, nominal
  • Latin physica natural science (Medieval Latin: medical science)
  • Old French fisique)
  • (noun, nominal) Middle English fisyk(e), phisik(e) ( 1250–1300

Collins Concise English Dictionary © HarperCollins Publishers::

physics /ˈfɪzɪks/ n (functioning as singular)
  1. the branch of science concerned with the properties of matter and energy and the relationships between them. It is based on mathematics and traditionally includes mechanics, optics, electricity and magnetism, acoustics, and heat. Modern physics, based on quantum theory, includes atomic, nuclear, particle, and solid-state studies. It can also embrace applied fields such as geophysics and meteorology
  2. physical properties of behaviour: the physics of the electron
  3. archaic natural science or natural philosophy
Etymology: 16th Century: from Latin physica, translation of Greek ta phusika natural things, from phusis nature

physic /ˈfɪzɪk/ n
  1. rare a medicine or drug, esp a cathartic or purge
  2. archaic the art or skill of healing
vb ( -ics, -icking, -icked)
  1. (transitive) archaic to treat (a patient) with medicine
Etymology: 13th Century: from Old French fisique, via Latin, from Greek phusikē, from phusis nature

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