bio-, bi-, -bia, -bial, -bian, -bion, -biont, -bius, -biosis, -bium, -biotic, -biotical +

The study of living in a healthy state.

A reference to an organism tolerating a wide range of a particular environmental factor.

1. One who studies life that originates on the outside, or exterior, of an organism.
2. One who studies extraterrestrial life.

A branch of biology with a special interest in the search for life on other planets and elesewhere in the universe, and with the study of conditions that might give rise to extraterrestrial life, as well as the study of the effects of extraterrestrial environments.

Living on the exterior of a substrate (substratum) [base to which a stationary animal or a plant is fixed] or the outside of an organism.

Someone who studies the biosphere or who specializes in the study of the interdisciplinary field of scientific research that explores interactions between the biosphere, the lithosphere, and the atmosphere.

1. The study of the biosphere.
2. An interdisciplinary field of scientific research that explores interactions between the biosphere and the lithosphere and/or the atmosphere.

A plant that is associated with dry land.

An organism spending its whole life in the soil or ground.

The total life of the land; that part of the Earth’s surface occupied by terrestrial organisms; terrestrial life.

1. The study of organisms or conditions that are either free of germs or associated only with known or specified germs.
2. The study of animals in the absence of contaminating microorganisms; that is, of “germ-free” animals.

1. A condition in which animals are sterile both internally and externally, or of the procedures used to secure and maintain these conditions.
2. Growing organisms by themselves or in association with other completely known kinds of organisms; raising gnotobiotic organisms.
3. A condition in which all the forms of life present within an organism can be accounted for. Typically these organisms are germfree or gnotophoric (having only one contaminant).

Living colonies or species, assembled from pure isolates (separations).

1. An individual organism from a group assembled from pure isolates or separations from other organisms. Also, gnotobiota.
2. A germ-free animal infected with one or more microorganisms in order to study the microorganism in a controlled situation.

1. A reference to germ-free or formerly germ-free organisms in which the composition of any associated microbial flora, if present, is fully defined.
2. The study of organisms or environmental conditions that have been rendered free of bacteria or contaminants or into which a known microorganism or contaminant has been introduced for research purposes.

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