English phrase Q!

<p>This might be out of topic, but does anyone know what "in vivo" and "in vitro" mean?
Thanks if you're willing to reply.</p>

<p>in vivo = in a living thing</p>

<p>For example, I research biologist might conduct a new drug study in vivo. </p>

<p>in vitro = outside a living thing/in an artificial environment</p>

<p>In vitro fertilization means fertilizing a woman's egg outside of the womb (making a "test-tube" baby).</p>