triatomic /trī-ə-tomˈik/

1. Consisting of three atoms
2. Having three replaceable atoms or groups
3. Trivalent

• book of original entry
• book of prime entry
• Book of Psalms
• book of words
• book out
• bookplate
• bookplates
• book-post
• book-posts
• book price
• book prices
• bookrest
• bookrests
• books
• book-scorpion
• book-scorpions
• bookseller
• booksellers
• bookselling
• booksellings
• bookshelf
• bookshelves
• bookshop
• bookshops
• booksie