addendum /ə-denˈdəm/

1. A thing to be added, such as supplementary material to a book, etc
2. The distance between the centre and the outer edge of a tooth on a gear or of the thread of a screw (engineering)

• two-wheeler
• two-wheelers
• two-year-old
• two-year-olds
• twp
• twy-
• twyer
• twyere
• twyeres
• twyers
• twyfold
• twyforked
• twyformed
• twy-natured
• TX
• Tyburn
• Tyburn-ticket
• Tyburn-tippet
• Tyburn-tree
• Tyche
• tychism
• tychisms
• Tychonic
• tycoon
• tycoonate