We found 9 dictionaries that define the word hrb:

General (3 matching dictionaries)

1. HRB: Dictionary.com
2. HRB (gene), HRB: Wikipedia, the Free Encyclopedia
3. HRB: Wiktionary

Miscellaneous (2 matching dictionaries)

4. HRB: Acronym Finder
5. AbbreviationZ (No longer online)

Science (1 matching dictionary)

6. HRB: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (1 matching dictionary)

7. hrb: Urban Dictionary

Tech (2 matching dictionaries)

8. HRB: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
9. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

Definitions from Wiktionary (HRB) ▸ noun:  (materials science) Abbreviation of hardness on Rockwell scale B. ▸ Words similar to hrb ▸ Usage examples for hrb ▸ Idioms related to hrb ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hrb ▸ Words that often appear near hrb ▸ Rhymes of hrb ▸ Invented words related to hrb