We found 4 dictionaries that define the word preen glands:

General (2 matching dictionaries)

1. preen glands: Merriam-Webster
2. preen glands: TheFreeDictionary.com

Computing (1 matching dictionary)

3. preen glands: Encyclopedia

Medicine (1 matching dictionary)

4. preen glands: Medical dictionary

(Note: See preen_gland as well.)

Definitions from WordNet (preen gland) ▸ noun:  oil-secreting gland situated at the base of the tail in most birds ▸ Also see preen_gland ▸ Words similar to preen glands ▸ Usage examples for preen glands ▸ Idioms related to preen glands ▸ Wikipedia articles (New!) ▸ Words that often appear near preen glands ▸ Rhymes of preen glands ▸ Invented words related to preen glands