mortal sin
— Noun
– English
~ an unpardonable sin entailing a total loss of grace; "theologians list seven mortal sins"
Mount Sinai
— Noun
– English
~ a mountain peak in the southern Sinai Peninsula (7,500 feet high); it is believed to be the peak on which Moses received the Ten Commandments
Meryta sinclairii
— Noun
– English
~ small roundheaded New Zealand tree having large resinous leaves and panicles of green-white flowers
maxillary sinus
— Noun
– English
~ one of a pair of sinuses forming a cavity in the maxilla
Myxinikela siroka
— Noun
– English
~ fossil hagfish of the Pennsylvanian period (c. 300 million years ago) that resembled modern hagfishes
mid-sixties
— Noun
– English
~ the time of life between 60 and 70
moderate-size
— Adjective
– English
~ intermediate in size
medium-size
— Adjective
– English
~ intermediate in size
moderate-sized
— Adjective
– English
~ intermediate in size
mouse-sized
— Adjective
– English
~ having the approximate size of a mouse
man-sized
— Adjective
– English
~ very large; appropriate to the size of a man; "a man-sized piece of cake"
medium-sized
— Adjective
– English
~ intermediate in size
man-sized
— Adjective
– English
~ calling for the strength of a man; "a man-sized job"
mechanically skillful
— Adjective
– English
~ relating to or concerned with machinery or tools; "mechanical arts"; "mechanical design"; "mechanical skills"; "a technical fault"
mountain skink
— Noun
– English
~ frequents oak and pine habitats in rocky mountainous areas of United States southwest and Mexico
mule skinner
— Noun
– English
~ a worker who drives mules
Marya Sklodowska
— Noun
– English
~ French chemist (born in Poland) who won two Nobel prizes; one (with her husband and Henri Becquerel) for research on radioactivity and another for her discovery of radium and polonium (1867-1934)
mad-dog skullcap
— Noun
– English
~ an American mint that yields a resinous exudate used especially formerly as an antispasmodic
mackerel sky
— Noun
– English
~ a sky filled with rows of cirrocumulus or small altocumulus clouds
microscope slide
— Noun
– English
~ a small flat rectangular piece of glass on which specimens can be mounted for microscopic study