| Substance | Abbreviation | Systematics | Provings |
| Yatren Yatren |
Yatren | Synthetic Drugs |
|
| Yersinium / Yersinia enterocolitica |
Yersin | Enterobacteriaceae |
|
| Yponomeuta rorrella Willow Ermine Moth |
Ypo-r | Yponomeutidae |
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| Ytterbium aceticum |
Ytte-act | Carbonium Lanthanida |
|
| Ytterbium boricum |
Ytte-bor | Borium Lanthanida |
|
| Ytterbium bromatum |
Ytte-br | Bromium Lanthanida |
|
| Ytterbium carbonicum Ytterbium (III) Carbonate |
Ytte-c | Carbonium Lanthanida |
|
| Ytterbium causticum |
Ytte-caust | Lanthanida |
|
| Ytterbium fluoratum |
Ytte-f | Fluorum Lanthanida |
|
| Ytterbium iodatum |
Ytte-i | Iodium Lanthanida |
|
| Ytterbium lacticum |
Ytte-l | Carbonium Lanthanida |
|
| Ytterbium metallicum Ytterbium |
Ytte | Lanthanida |
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