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

Antonym: interspecies

• interstitial
• interstitial cell-stimulating hormone
• interstitial fluid
• interstitial plasma cell pneumonia
• interstitial pneumonia
• interstitial tissue
• interstratify
• intertextuality
• intertidal
• intertribal
• intertrigo
• intertropical
• intertwine
• intertwist
• interurban
• interval
• intervale
• intervene
• intervener
• intervening
• intervenor
• intervention
• interventionism
• interventionist
• interventricular foramen