twin·ning 
(twĭnĭng)
(twĭnĭng)n.
1. The bearing of twins.
2. A pairing or union of two similar or identical objects.
3. Mineralogy The formation of twin crystals.
- Indo-European root: āter-
- Indo-European root: ōku-
- Indo-European root: ōs-
- Indo-Germanic
- Indo-Hittite
- Indo-Iranian
- indole
- indoleacetic acid
- indoleamine
- indolebutyric acid
- indolence
- indolent
- indolently
- Indomalayan
- indometacin
- indomethacin
- indomitability
- indomitable
- indomitableness
- indomitably
- Indonesia
- Indonesian
- indoor
- indoor-outdoor
- indoors