English word meso- comes from Proto-Indo-European *me (In the middle of, near, by, around, with.), German mittels (By (indicates a means).)
| Dictionary entry | Language | Definition |
|---|---|---|
| *me | Proto-Indo-European (ine-pro) | In the middle of, near, by, around, with. |
| mittels | German (deu) | By (indicates a means). |
| *meth₂- | Proto-Indo-European (ine-pro) | |
| *médʰyos | Proto-Indo-European (ine-pro) | Middle. |
| *métsos | Proto-Hellenic (grk-pro) | Between. Middle. |
| μέσῳ | Ancient Greek (grc) | |
| meso- | English (eng) | (chemistry) Designating an achiral member of a group of diastereoisomers that has at least one chiral member. Intermediate. Middle. |