noun

• (archaic) A sweetheart; a prostitute or a mistress.
• (colloquial) A defined opinion.
• (informal) A dachshund.
• (informal, pharmacology) Clipping of doxycycline. [(pharmacology) A broad-spectrum antibiotic C₂₂H₂₄N₂O₈ of the tetracycline class, which has a long half-life in the body and used orally to treat various bacterial infections.]