The Andean medicinal herb Lepidium meyenii, or an extract of the root of this plant.

plural of maca

plural of macaca

(art) A conventional subject in art, literature and drama, or a particular work in that style, in which death (in the form of a putrid corpse, skeleton, the Grim Reaper, etc) is shown leading people to the grave.

In a macabre manner

(obsolete) Any of several species of lemurs.

A macaque, or similar monkey.

Representing or personifying death. / Obsessed with death or the gruesome. / Ghastly, shocking, terrifying.

(dated) Any of a group of Old World monkeys of the genus Macaca; a macaque.

(US politics, informal) A situation where a politician says something controversial that harms their chances of success.