(biology) A species that normally lives and thrives in a particular ecosystem. This can include any species that developed with the surrounding habitat, and can be assisted by or affected by a new species.

(biology) Any species that has been introduced to an environment where it is not native, and that has since become a nuisance through rapid spread and increase in numbers, often to the detriment of native species.

(taxonomy) The second (uncapitalized) word in the scientific name of a species, following the name of the genus.

Marked with dots or spots, spotted. / Sporadically and irregularly marked.

(zoology) The second word in the scientific name of a species, following the name of the genus.

(botany) a measure of leaf thickness, calculated by dividing the area of a portion of a leaf by the dry weight of that same portion of leaf.

(physics) The ratio of the electric charge to the mass of a particle

(astronomy) an indication of the physical and chemical characteristics of a star based on the spectrum of light that it emits

The ratio of the thrust produced by a rocket or other jet engine to the rate of use of propellant.

A small spot or speck on the skin, plumage or foliage. / (physics) The random distribution of light when it is scattered by a rough surface. / (Scotland) Kind; sort.