(n) lie detector test
polygraph test
(n) pornography
(n) Marshall Plan
(n) (comp) microdrive
(n) microfarad
(n) (regular) screwdriver (wasei: minus driver, i.e. - driver)
flathead screwdriver
slotted screwdriver
(n) mountain gorilla
(n) macadam roller
(n) (comp) macro assembler
(n) (comp) macrothesaurus
(n) machine language
(n) mass democracy
(n) Magellanic penguin (Spheniscus magellanicus)
(n) Madras check
(n) marine ranching
(n) multichanneler
(n) multiflash
(n) mandarin collar
(n) mammography
(n) meteorite
(n) (uk) Pheropsophus jessoensis (species of bombardier beetle)
(n) mediocracy
(n) (uk) southern right whale (Eubalaena australis)
(n) (uk) Arnoux's beaked whale (Berardius arnuxii)
(n) mineral water
(n) (uk) Miquel's mazus (species of small flowering plant, Mazus miquelii)
(n) (uk) Ohio spiderwort (Tradescantia ohiensis)
(n) metallic color
metallic colour
(n) mediacracy
(n) media scrum