We found 6 dictionaries that define the word portal systems:

General (3 matching dictionaries)

1. portal systems: Merriam-Webster
2. portal systems: Vocabulary.com
3. portal systems: TheFreeDictionary.com

Computing (1 matching dictionary)

4. portal systems: Encyclopedia

Medicine (2 matching dictionaries)

5. portal systems: Merriam-Webster Medical Dictionary
6. portal systems: Medical dictionary

(Note: See portal_system as well.)

Definitions from WordNet (portal system) ▸ noun:  system of veins that carry blood from the abdominal organs to the liver ▸ Also see portal_system ▸ Words similar to portal systems ▸ Usage examples for portal systems ▸ Idioms related to portal systems ▸ Wikipedia articles (New!) ▸ Words that often appear near portal systems ▸ Rhymes of portal systems ▸ Invented words related to portal systems