The Collaborative International Dictionary
A mensa et thoro
A mensa et thoro \A men"sa et tho"ro\ [L., from board and bed.]
(Law)
A kind of divorce which does not dissolve the marriage bond,
but merely authorizes a separate life of the husband and
wife.
--Abbott.
Wiktionary
a mensa et thoro
adv. (context historical legal of a divorce English) Such as not to dissolve the marriage bond, but merely to authorize the husband and wife to live apart from each other.