tri·cyc·lic 
(trī-sĭklĭk, -sīklĭk)
(trī-sĭklĭk, -sīklĭk)adj.
Having or being a molecular structure that contains three closed rings: a tricyclic molecule.
n.
A tricyclic antidepressant drug.
- toon
- to (one's) face
- to one's face
- to (one's) heart's content
- to one's heart's content
- to (one's) name
- to one's name
- toonie
- to order
- toot
- tooter
- tooth
- toothache
- toothache tree
- tooth and nail
- toothbrush
- toothed
- toothed whale
- tooth fairy
- toothily
- toothless
- toothlessly
- toothlessness
- toothpaste
- toothpick