We found 9 dictionaries that define the word mustard plasters:

General (5 matching dictionaries)

1. mustard plasters: Merriam-Webster
2. mustard plasters: Collins English Dictionary
3. mustard plasters: Vocabulary.com
4. mustard-plasters, mustard plasters: Wiktionary
5. mustard plasters: TheFreeDictionary.com

Computing (1 matching dictionary)

6. mustard plasters: Encyclopedia

Medicine (2 matching dictionaries)

7. mustard plasters: Merriam-Webster Medical Dictionary
8. mustard plasters: Medical dictionary

Tech (1 matching dictionary)

9. Book Binding (No longer online)

(Note: See mustard_plaster as well.)

Definitions from Wiktionary (mustard plaster) ▸ noun:  A poultice of mustard seed powder spread inside a protective dressing and applied to the chest or abdomen to stimulate healing. ▸ Also see mustard_plaster ▸ Words similar to mustard plasters ▸ Usage examples for mustard plasters ▸ Idioms related to mustard plasters ▸ Wikipedia articles (New!) ▸ Words that often appear near mustard plasters ▸ Rhymes of mustard plasters ▸ Invented words related to mustard plasters