1. (a sibilant exclamation used to attract attention).

  1. variant of histo- before a vowel: histidine.

  1. histology.
  2. historian.
  3. historical.
  4. history.


  1. an exclamation used to attract attention or as a warning to be silent

exclamation commanding silence, attested from 1610s; probably so chosen because the sound is both easy to hear and suddenly silent.


  1. Variant ofhisto-

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