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Astronomy

The scientific study of planets, stars, black holes, comets and other celestial bodies that make up outer space.

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cataphyll

Plants; Flowers

In cycads, a scale-like modified leaf which protects the developing true leaves.

columella

Plants; Flowers

A small column of tissue which runs up through the center of a spore capsule. It is present in hornworts, mosses, and some rhyniophytes.

compound leaves

Plants; Flowers

Leaves with two or more leaflets attached to a single leaf stem.

cotyledon

Biology; Flowers

The "seed leaves" produced by the embryo of a seed plant that serve to absorb nutrients packaged in the seed, until the seedling is able to produce its first true leaves and ...

elater

Plants; Flowers

A cell or part of a cell which assists in dispersing spores. The elaters change shape as they lose or acquire water, and they will then push against surrounding spores.

embryophyte

Plants; Flowers

Synonym for the Plantae, as here defined. It includes all green photosynthetic organisms which begin the development of the sporophyte generation within the archegonium.

enations

Plants; Flowers

Flaps of tissue such as those found on psilophytes.

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