Merriam-Webster's Collegiate Dictionary:
merit
merit system
meritless
meritocracy
meritocrat
meritocratic
meritorious
meritoriously
meritoriousness
merl
merle
merlin
merlon
merlot
mermaid
merman
mero-
mero?
mero?, isle of
meroblastic
meroblastically
merocrine
meroite
meroitic
meromorphic
meromyosin
merovingian
merozoite
merrifield
merrill
merrillville
merrily
merrimack
merriment
merriness
merritt island
merry
merry widow
merry-andrew
merry-go-round
merrymaker
merrymaking
merrythought
mersey
merseyside
mersin
merthiolate
merthyr tydfil
merton
meru, mount
mes-
mesa
mesa verde national park
mesabi range
mesarch
mescal
mescal button
mescalero
mescaline
mesclun
mesdames
mesdemoiselles
meseems
mesembryanthemum
mesencephalic
mesencephalon
mesenchymal
mesenchyme
mesenteric
mesenteron
mesentery
meseta
mesh
meshed
meshuga
meshugah
meshuggah
meshugge
meshuggener
meshwork
mesial
mesially
mesic
mesmer
mesmeric
mesmerically
mesmerise
mesmerism
mesmerist
mesmerize
mesmerizer
mesne
mesne lord
meso-
mesoamerica
mesoamerican
mesocarp
