Definition of "PRO"

PRO¹

noun
countable and uncountable, plural PROs
1. Initialism of pressure retarded osmosis.
2. (medicine) Initialism of patient-reported outcome.
  Quotations
  In the bivariate analysis carried out by subgroups, we did not find statistically significant differences (p < 0.05) between bionaïve or bioexperienced patients, patients with BMI < 30 or BMI > 30 in relation to the efficacy variables (PASI and BSA) and analyzed PROs (VAS pruritus and DLQI).
  2022 August 30, Ricardo Ruiz-Villaverde, Lourdes Rodriguez Fernandez-Freire, Pilar Font-Ugalde, Manuel Galan-Gutierrez, “Tildrakizumab: Efficacy, Safety and Survival in Mid-Term (52 Weeks) in Three Tertiary Hospitals in Andalucia (Spain)”, in Journal of Clinical Medicine‎, volume 11, number 17, page 5

PRO²

symbol
1. (syntax) A theoretical phonologically null pronoun