1. Arising or occurring within a species; involving the members of one species
   - intraspecific

Antonym: interspecies

• Bacillus subtilis
• bacitracin
• back
• back and forth
• back away
• back bacon
• back boiler
• back brace
• back breaker
• back burner
• back channel
• back circle
• back country
• back end
• back entrance
• back exercise
• back judge
• back matter
• back of beyond
• back of Bourke
• back off
• back out
• back passage
• back porch
• back to front