There are 11 words that start with 'mesen'.
| mesentera | mesentery |
| mesenchyme | mesenteric |
| mesenteron | mesenchymal |
| mesenchymes | mesenteries |
| mesencephala | mesencephalic |
| mesencephalon | |
Note: These 11 words that start with 'mesen' are found from the USA & Canada version of the tournament Scrabble word list.