anodont dentition - argyrodite
- anorthitissite
- anorthitite
- anorthoclase
- anorthoclase sanidine
- anorthoclasite
- anorthose
- anorthosite
- anorthositization
- anosma
- anoxic
- anoxic conditions
- ant anal
- antagonism
- antamokite
- antanal side
- antapical
- antarctic
- antarctic bottom water
- antarctic circumpolar water mass
- antarctic easterlies
- antarctic intermediate water
- Antarctic ocean
- Antarctic pole
- Antarctic region
- antarctic whiteout
- antarcticite
- ante-turma
- antecedence
- antecedent
- antecedent behaviour
- antecedent period
- antecedent river
- antecedent stream
- antecedent valley
- anteclase
- anteclise
- anteclypeus
- anteconsequent
- antediluvian
- antenna