(physics) Any meson, such as an upsilon particle, formed from a bottom quark and its antiquark.

A pit with no visible bottom (apparently-infinite depth). / (biblical) Hell. / (figuratively) An endless resource or supply.

plural of bottomonium

plural of bottomonium

(chiefly US) Flat land along a river, lying a few feet above normal high water, often consisting of alluvial deposits and naturally fertile.

plural of bottomland

plural of bottomry

Alternative form of bottom-most

(in combinations) The state or quality of having a particular type of bottom.

In a bottomless manner.