| Substance | Abbreviation | Systematics | Provings |
| Ibandronicum acidum Ibandronic Acid |
Iban-ac | Synthetic Drugs |
|
| Iberis amara Bitter Candytuft |
Iber | Cruciferae/ Brassicaceae |
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| Iberis sempervirens Evergreen candytuft |
Iber-s | Cruciferae/ Brassicaceae |
|
| Ibicella lutea |
Ibic-l | Martyniaceae |
|
| Ibuprofenum Ibuprofen |
Ibu | Synthetic Drugs |
|
| Ichthyolum Sulphonated Bitumen |
Ichth | Oils and similar Compounds of Carbon |
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| Ichthyosaurus spec. fossil |
Ichthy-foss | Ichthyosauridae fossil |
|
| Icosaedron Icosahedron |
Icos | Abstracta |
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| Ictodes foetida/ Pothos foetidus Skunk Cabbage |
Ictod | Araceae |
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