tufa /tooˈfə, tūˈfə/

1. Calc-sinter (often calcareous tufa)
2. Tuff or other porous rock (obsolete)

• youngness
• youngnesses
• young offender
• young offender institution
• young offenders
• young people
• young person
• Young Pretender
• youngs
• Young's modulus
• youngster
• youngsters
• youngth
• youngthly
• youngths
• Young Turk
• Young Turks
• younker
• younkers
• your
• you're
• you're on
• you're telling me
• you're welcome
• your humble servant