12-letter words containing a, z, r, e, l
- zero tillage — no-tillage.
- zielona gora — a city in W Poland.
- zillionaires — Plural form of zillionaire.
- zoochlorella — any of various symbiotic green algae in the cytoplasm of certain freshwater invertebrates, as stentors and hydras.
- zorn's lemma — a theorem of set theory that if every totally ordered subset of a nonempty partially ordered set has an upper bound, then there is an element in the set such that the set contains no element greater than the specified given element.