re·tro·vi·rol·o·gy 
(rĕt′rō-vī-rŏlə-jē)
(rĕt′rō-vī-rŏlə-jē)n.
The study of retroviruses and retroviral diseases.
ret′ro·vi·rolo·gist n.
- closely
- close-minded
- close-minded
- close-mouthed
- closemouthed
- close near the wind
- closeness
- close-order drill
- close out
- closeout
- closer
- close shave
- close/shutthe door on
- closet
- closet drama
- closeted
- closetful
- close the book on
- close to heart
- close to home bone
- close to home/the bone
- close to/near the wind
- close to one's heart
- close to the bone
- close to the wind