(botany) The area in a plant's leaf, stem, or fruit stalk, where the abscission layer if formed along with weakened sclerenchyma, absent collenchyma, and dense cytoplasm.

(of a tidal coast) The intertidal zone / (of a non-flowing, non-tidal body of water) The zone of shallow water to the limit at which plants root.

Alternative letter-case form of zodiac

Alternative spelling of zaatar

(mathematics) A matrix whose entries are all zero.

(geography) The oceanic realm consisting of the deep ocean, typified by a dearth of plant life, and plentiful carnivorous animals that are able to withstand extreme pressure.

plural of New Zealand pigeon

A large species of pigeon, Hemiphaga novaeseelandiae, native to New Zealand.

(geology, often humorous, by analogy to erogenous zone) A region characterized by mountain-building.

plural of zero hour