Word Reference (EN-ES)

http://www.wordreference.com/

Merriam Webster (EN-EN)

https://www.merriam-webster.com/

Mayo Clinic (diseases)

http://www.mayoclinic.org/diseases-conditions

Merck Manual – Home Edition (diseases)

http://www.merckmanuals.com/home

Orthopedics:

https://www.medicalcenter.com.mx/brazo-y-muneca