We found 10 dictionaries that define the word atra:

General (5 matching dictionaries)

1. Atra, atra: Wordnik
2. ATRA: Wiktionary
3. ATRA: Dictionary.com
4. ATRA, Atra: Wikipedia, the Free Encyclopedia
5. ATRA: Stammtisch Beau Fleuve Acronyms

Medicine (1 matching dictionary)

6. ATRA: Dictionary of Cancer Terms

Miscellaneous (2 matching dictionaries)

7. ATRA: Acronym Finder
8. AbbreviationZ (No longer online)

Science (1 matching dictionary)

9. atra: Dictionary of Botanical Epithets

Slang (1 matching dictionary)

10. Atra: Urban Dictionary

Definitions from Wiktionary (ATRA) ▸ noun:  (organic chemistry, pharmacology) Initialism of all-trans retinoic acid. [(organic chemistry, pharmacology) Tretinoin.] Similar: Vipera, candidus, modesta, amaru, virens, pusilla, solitarius, POSITA, cinereus, cristata, more... Opposite: repulsive, unattractive, ugly, unpleasant, hideous Phrases: fulica atra, stachybotrys atra, salamandra atra, more... Adjectives: viviparous, fusco, oral, qual, excess, nak, intermittent, coot, simultaneous, podura ▸ Words similar to atra ▸ Usage examples for atra ▸ Idioms related to atra ▸ Wikipedia articles (New!) ▸ Popular adjectives describing atra ▸ Words that often appear near atra ▸ Rhymes of atra ▸ Invented words related to atra