Ad libitum is Latin for "at one's pleasure", often shortened to Ad lib. ...more on Wikipedia about "Ad libitum"
Ex vivo is an experimental technique where either the experiment is performed in vivo and then analyzed in vitro or where part of the subject is removed, the experiment is performed, and the part is returned. ...more on Wikipedia about "Ex vivo"
in silico is an expression used to mean "performed on computer or via computer simulation." The phrase is coined from the Latin phrases in vivo and in vitro that are commonly used in biology (see also systems biology) and refer to experiments done in living organisms and outside of living organisms, respectively. Contrary to widespread belief, in silico does not mean anything in Latin. ...more on Wikipedia about "In silico"
In utero is Latin and means "before birth", literally "in the uterus". This term is widely used in biology. ...more on Wikipedia about "In utero"
In vitro ( Latin: "within glass") is an experimental technique where the experiment is performed in a test tube, or generally outside a living organism or cell. An example is in vitro fertilization. Alternatives of in vitro include in vivo and in silico: within an organism, and computational, respectively. Many experiments that deal with molecular biology are conducted outside organisms or cells, where the conditions and therefore results may not represent those inside the cell. This is why results are often annotated with in vivo, in vitro, or in silico, as applies. ...more on Wikipedia about "In vitro"
In vivo ( Latin for (with)in the living). In vivo is used to indicate the presence of a whole/living organism, in distinction to a partial or dead organism, or a computer model. ...more on Wikipedia about "In vivo"
Incertae sedis—"of uncertain position (seat)"—is a term used to define a taxonomic group where its broader relationships are unknown or undefined. ...more on Wikipedia about "Incertae sedis"
"Omne vivum ex ovo" is Latin for "All life [is] from [an] egg". This is a foundational concept of modern biology. Up into the 19th century it was commonly believed that under certain conditions life forms could appear spontaneously (" spontaneous generation"); for example, that maggots would spontaneously appear in rotten flesh, or that algae would spontaneously form in water, or that eel were generated when horse hairs fell into streams. Only with knowledge of modern cell biology was it established that all currently living organisms are descendants of one or more very similar parent organisms. ...more on Wikipedia about "Omne vivum ex ovo"
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