Bary-
Greek; heavy
Bathy-
Greek; deep
Bell-/belli-
Latin; war
Bi-
Latin; two
Biblio-
Greek; book
Blephar-/blepharo-
Greek; eyelid
Boc- Bocc- bouch-
Spanish, Italian, French; mouth
Bucc-
Latin; mouth, cheek
Brachy-
Greek; short
Brady-
Greek; slow
Brevi-
Latin; short
Butyr-
Latin; butter