| Word | Definitions | Synonyms |
|---|---|---|
| interspecies | (adjective) arising or occurring between species | Synonyms: interspecific |
| intraspecies | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecific |
| isosceles | (adjective) (of a triangle) having two sides of equal length | - |
| offsides | (adjective) illegally beyond a prescribed line or area or ahead of the ball or puck | Synonyms: offside |