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- Zacuto (or Zacut), Abaham Bar Samuel Bar Abraham
- Zaglossus
- zalambdodont
- Zalužanskiý Ze Zalužan Adam
- Zambeccari, Giuseppe
- Zambonini, Ferruccio
- Zamiaceae
- Zanclian
- Zannichelliaceae
- Zanotti, Eustachio
- zapote
- Zaprora silenus
- Zaproridae
- Zarankiewicz, Kazimierz
- Zavadovsky, Mikhail Mikhaylovich
- Zavarzin, Aleksey Alekseevich
- zeatin
- Zebu cattle
- Zechstein
- Zechstein