We found 9 dictionaries that define the word metric grain:

General (7 matching dictionaries)

1. metric grain: Collins English Dictionary
2. metric grain: Vocabulary.com
3. metric grain: Dictionary.com
4. metric grain: Rhymezone
5. metric grain: FreeDictionary.org
6. metric grain: Mnemonic Dictionary
7. metric grain: TheFreeDictionary.com

Computing (1 matching dictionary)

8. metric grain: Encyclopedia

Science (1 matching dictionary)

9. How Many? A Dictionary of Units of Measurement (No longer online)

(Note: See metric_grains as well.)

Definitions from WordNet (metric grain) ▸ noun:  used for pearls or diamonds: 50 mg or 1/4 carat Opposite: imperial grain, non-metric grain, traditional grain ▸ Words similar to metric grain ▸ Usage examples for metric grain ▸ Idioms related to metric grain ▸ Wikipedia articles (New!) ▸ Words that often appear near metric grain ▸ Rhymes of metric grain ▸ Invented words related to metric grain