We found 6 dictionaries that define the word columnar layer:

General (1 matching dictionary)

1. columnar layer: TheFreeDictionary.com

Business (1 matching dictionary)

2. columnar layer: Legal dictionary

Computing (1 matching dictionary)

3. columnar layer: Encyclopedia

Medicine (3 matching dictionaries)

4. Dorland's Illustrated Medical Dictionary (No longer online)
5. online medical dictionary (No longer online)
6. columnar layer: Medical dictionary

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