diapedesis

https://doi.org/10.1351/goldbook.13093
Movement of blood cells, particularly leukocytes, from the blood across blood vessel walls into tissues.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1157 [Terms] [Paper]