Trifolium :: Trifolium (n.) A genus of leguminous herbs with densely spiked flowers and usually trifoliate leaves; trefoil. There are many species, all of which are called clover. See Clover..
Triforium :: Triforium (n.) The gallery or open space between the vaulting and the roof of the aisles of a church, often forming a rich arcade in the interior of the church, above the nave arches and below the clearstory windows..
Triform :: Triform (a.) Having a triple form or character.
Triformity :: Triformity (n.) The state of being triform, or of having a threefold shape..
Vitriform :: Vitriform (a.) Having the form or appearance of glass; resembling glass; glasslike.