| Term | Definition |
|---|---|
| immunologic functions | Production and action of cells that fight disease or infection. Hits - 845 |
| impaired | Being classified as weakened or damaged. Hits - 818 |
| impending | Is about to happen. Hits - 908 |
| impenetrable | Impossible to pass through or enter. Hits - 835 |
| indigenous breeds | Originating or occurring naturally in a particular place, native Hits - 873 |
| indiscriminately | In a random manner; unsystematically. Hits - 869 |
| indistinguishable | Not being able to be identified as different or distinct. Hits - 889 |
| inexplicable | Unable to be explained or accounted for. Hits - 922 |
| infertility | The inability to conceive children or young. Hits - 885 |
| infestation | The presence of an unusually large number of insects or animals in a place, typically causing damage or disease Hits - 942 |
| innumerable | Too many to be counted (often used hyperbolically). Hits - 954 |
| insolvent | Being unable to pay debts owed. Hits - 845 |
| integral part | It is necessary to the completeness of the whole: This point Hits - 927 |
| intensification | The action of making or becoming more intense. Hits - 839 |
| interbreeding | (with reference to an animal) breed or cause to breed with another of a different race or species Hits - 917 |