in vivo

American  

[in vee-voh] / ɪn ˈvi voʊ /

adverb

1. (of a biological process) occurring or made to occur within a living organism or natural setting.

---

in vivo British  

/ ɪn ˈviːvəʊ /

adverb

1. (of biological processes or experiments) occurring or carried out in the living organism

---

in vivo Scientific  

/ ĭnvē′vō /

1. Inside a living organism.

2. Compare in vitro

---

in vivo Cultural  

1. In nature; literally, “in life.” In vivo conditions are distinguished from those that might exist only in a laboratory. (Compare in vitro.)

---

Etymology

Origin of in vivo

First recorded in 1900–05; from Latin in vīvō “in (something) alive”

Compare meaning

How does in-vivo compare to similar and commonly confused words? Explore the most common comparisons:

• in vivo vs. in vitro

Example Sentences

See Examples For:

in vivo

Key assets include the in vivo CAR-T candidate and T-cell engagers targeting multiple myeloma and ovarian cancer.

From Barron's ● Jun. 26, 2026

The company said it plans to launch clinical development of mRNA-6007, an in vivo CAR-T candidate, in 2027.

From Barron's ● Jun. 26, 2026

To better understand how the mutation functions in a living organism, the researchers are moving from in vitro experiments to in vivo studies.

From Science Daily ● Jun. 21, 2026

Future studies will focus on testing the biological effects of the newly discovered trace diterpenes and evaluating their safety and effectiveness in vivo.

From Science Daily ● Jan. 11, 2026

In this case then the condition of the blood in vivo is satisfactorily explained by the absence of function of bone-marrow.

From Histology of the Blood Normal and Pathological by Myers, W.