tuff /tuf, tŭf/

1. A rock composed of fine volcanic fragments and dust
2. Tufa or other porous rock (obsolete)

tuffāˈceous adjective

• undergoing
• undergone
• undergown
• undergowns
• undergrad
• undergrads
• undergraduate
• undergraduates
• undergraduateship
• undergraduette
• undergraduettes
• underground
• undergrounds
• undergrove
• undergroves
• undergrown
• undergrowth
• undergrowths
• underhand
• underhanded
• underhandedly
• underhandedness
• underhandednesses
• underhands
• under-hangman