1. Cannot be divided without leaving a remainder
   - undividable

See also: indivisible

• California single-leaf pinyon
• California sycamore
• California tree poppy
• California whipsnake
• California white fir
• California white oak
• California wine
• California yellow bells
• California yew
• Californian
• californium
• caliginous
• Caligula
• calipee
• caliper
• caliph
• caliphate
• Caliphate State
• calisaya
• calisthenic
• calisthenics
• calix
• Calixtus II
• Calixtus III
• calk