the location in a range of mountains of a geological formation that is lower than the surrounding peaks
mouse nest
Noun
where mice bear and raise their young
mouse's nest
Noun
where mice bear and raise their young
mud puddle
Noun
a puddle of mud
mull
Noun
a term used in Scottish names of promontories
mull
Verb
reflect deeply on a subject
mull
Verb
heat with sugar and spices to make a hot drink
mere
Adjective
being nothing more than specified
mere
Adjective
apart from anything else
mere
Noun
a small pond of standing water
multiple star
Noun
a system of three or more stars associated by gravity
mesa
Noun
flat tableland with steep edges
muon
Noun
an elementary particle with a negative charge and a half-life of 2 microsecond
meson
Noun
an elementary particle responsible for the forces in the atomic nucleus
mu-meson
Noun
an elementary particle with a negative charge and a half-life of 2 microsecond
mesotron
Noun
an elementary particle responsible for the forces in the atomic nucleus
mesosphere
Noun
the atmospheric layer between the stratosphere and the thermosphere
metal filing
Noun
a fragment of metal rubbed off by the use of a file
meteorite
Noun
stony or metallic object that is the remains of a meteoroid that has reached the earth's surface
meteoroid
Noun
(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere
mutagen
Noun
any agent (physical or environmental) that can induce a genetic mutation or can increase the rate of mutation
meteor
Noun
(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere
meteor
Noun
a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode
meteor swarm
Noun
a group of meteoroids with similar paths
micelle
Noun
an electrically charged particle built up from polymeric molecules or ions and occurring in certain colloidal electrolytic solutions like soaps and detergents
microfossil
Noun
a fossil that must be studied microscopically
micrometeorite
Noun
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
mother-of-pearl cloud
Noun
a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
micrometeoroid
Noun
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
micrometeor
Noun
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
midstream
Noun
the middle of a stream
mid-water
Noun
the water that is well below the surface but also well above the bottom
millpond
Noun
a pond formed by damming a stream to provide a head of water to turn a mill wheel
mountain range
Noun
a series of hills or mountains
mountain chain
Noun
a series of hills or mountains
mythical being
Noun
an imaginary being of myth or fable
mermaid
Noun
half woman and half fish
merman
Noun
half man and half fish
mythical monster
Noun
a monster renowned in folklore and myth
mythical creature
Noun
a monster renowned in folklore and myth
macrocosm
Noun
everything that exists anywhere
mineral vein
Noun
a layer of ore between layers of rock
Moloch
Noun
a tyrannical power to be propitiated by human subservience or sacrifice
manticore
Noun
a mythical monster having a human head with horns, the body of a lion, and the tail of a scorpion
mantichora
Noun
a mythical monster having the head of man (with horns) and the body of a lion and the tail of a scorpion
manticora
Noun
a mythical monster having the head of man (with horns) and the body of a lion and the tail of a scorpion
mantiger
Noun
a mythical monster having the head of man (with horns) and the body of a lion and the tail of a scorpion
messiah
Noun
any expected deliverer
male person
Noun
a person who belongs to the sex that cannot have babies