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Medical Word Parts - Letter: i
| Term | Definition |
| -ia | condition, state, disease |
| -iasis | condition, state |
| iatr/o | treatment, medicine |
| -ic | pertaining to |
| -ician | specialist, practitioner |
| icter/o | jaundice |
| ide/o | idea |
| idi/o | distinct |
| ile/o | ileum (final section of small intestine) |
| ili/o | ilium (uppermost and largest bone of the pelvis) |
| immun/o | immune, safe |
| in- | in, not or fiber |
| infra- | below, down, under |
| inguin/o | groin |
| inter- | between |
| intra- | within |
| intro- | within |
| iod/o | iodine |
| ion/o | ion |
| -ior | pertaining to |
| ipsi- | same |
| irid/o | iris |
| is/o | equal |
| isch/o | suppress |
| -ism | condition, process |
| -ismus | spasm, contraction |
| -ist | person who specializes |
| -ite | resembling, the nature of |
| -ites | like |
| ithy- | erect, straight |
| -itis | inflammation |