a·pol·o·gist 
(ə-pŏlə-jĭst)
(ə-pŏlə-jĭst)n.
A person who argues in defense or justification of something, such as a doctrine, policy, or institution.
- beta-carotene
- beta cell
- beta decay
- beta-endorphin
- beta error
- beta globulin
- betaine
- beta interferon
- Beta Israel
- betake
- beta-lactam
- beta-lactam antibiotic
- beta-lactamase
- betamethasone
- beta-oxidation
- beta particle
- beta ray
- beta-receptor
- beta rhythm
- beta sheet
- beta test
- beta-test
- betatron
- beta wave
- betaxolol