There are multiple definitions:

1. volatile organic compound(English)

   • organic chemical that has a high vapor pressure at ordinary room temperature
   • ASL, EPA, MACT, NMOC, NSPS, UATW, COVID-19, OSC, FHP, AQ, AQAMS, BAT, BREF, CLRTAP, EEA, EIA, EMAS, ENPI, FCCC, GAINS, IMPEL, IPPC, MAC, MAE, MEA, NEC, PM, PAH, POP, PRTR, BHR
   • Environment, Safety and health, Diagnostics, Olfactory system, Spectroscopy, Asthma
   • https://www.epa…ganic-compounds
   • https://www.lsh….uk/media/49791
   • http://ec.europ…nt/index_en.htm
   • https://doi.org…rax-2022-219708

2. vaso-occlusive crisis(English)

   • primary cause of hospitalization in patients with sickle cell disease. Treatment mainly consists of intravenous morphine or NSAIDs, which have many dose-related side effects
   • NSAID, VEST, SCD, ACS
   • Hematology, Erythrocyte
   • https://doi.org…55/2021/1373754
   • https://doi.org…9/ped.2017.0814

3. variant of concern(English)

   • viral reproduction of SARS-CoV-2 provides opportunities for the acquisition of advantageous mutations, altering viral transmissibility, disease severity, and/or allowing escape from natural or vaccine-derived immunity
   • SARS-CoV-2, WHO, COVID-19, DVT, VOI, VBM
   • Virology, Vaccination
   • https://doi.org…467-021-25915-7
   • https://www.ecd…n in the EU/EEA
   • https://doi.org…jcv.2022.105160