-mˌmōst, esp Brit also -mməst adjective
1.
a.
(1) : that is at the very bottom
a village at the bottommost part of the mountain
: farthest down : lowest
sitting on the bottommost step
(2) : that is closest to the end
the bottommost part of the day — Alfred Kazin
b.
(1) : deepest
the bottommost depths of the sea
(2) : most profound
pangs of bottommost grief
2. : most fundamental : most basic
the bottommost problems facing the world