There are multiple definitions:

1. familial cold urticaria(English)

   • aka FCAS
   • FCAS
   • Dermatology

2. flexor carpi ulnaris(Latin)

   • FCR, ECU, PIN
   • Anatomy, Musculoskeletal system
   • http://www.bone…er-limb/forearm

3. first-catch urine(English)

   • can be further evaluated by culture of urethral swabs in cases of sexually transmitted diseases
   • NG, PID, STD
   • Transmissible disease, Urology, Sexuality
   • https://doi.org…0070(91)90009-B