nervous strain
— Noun
– English
～ (psychology) nervousness resulting from mental stress; "his responsibilities were a constant strain"; "the mental strain of staying alert hour after hour was too much for him"
narrow-leaved strap fern
— Noun
– English
～ fern with shorter and narrower leaves than Florida strap fern; Florida to West Indies and Mexico and south to Argentina
neural structure
— Noun
– English
～ a structure that is part of the nervous system
nature study
— Noun
– English
～ the study of animals and plants in the natural world (usually at an elementary level)
New Style calendar
— Noun
– English
～ the solar calendar now in general use, introduced by Gregory XIII in 1582 to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
Nova style salmon
— Noun
– English
～ brine-cured salmon that is less salty than most; sometimes sugar is also used in the curing
nuclear submarine
— Noun
– English
～ a submarine that is propelled by nuclear power
native sulfur
— Noun
– English
～ an old name for sulfur
native sulphur
— Noun
– English
～ an old name for sulfur
not surprised
— Adjective
– English
～ not surprised or expressing surprise; "that unsuprised obstinate look on his face"
neck sweetbread
— Noun
– English
～ edible thymus gland of an animal
Nyssa sylvatica
— Noun
– English
～ columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall
nephrotic syndrome
— Noun
– English
～ a syndrome characterized by edema and large amounts of protein in the urine and usually increased blood cholesterol; usually associated with glomerulonephritis or with a complication of various systemic diseases
Noonan's syndrome
— Noun
– English
～ syndrome seen only in males; marked by short stature and lowset ears and subnormal fertility
nervous system
— Noun
– English
～ the sensory and control apparatus consisting of a network of nerve cells
navigational system
— Noun
– English
～ a system that provides information useful in determining the position and course of a ship or aircraft