=Naiads=, _n._ In Greek and Roman mythology, water nymphs. Beautiful
young goddesses presiding over springs and streams.
=Nasturtium=, _n._ L. _nasus_, nose, _tortus_, convulsed; the name of
a plant, so called because of its acrid juice that causes a stinging
sensation at the back of the nose when it is tasted.
=Nectar=, _n._ The drink of the gods on Mt. Olympus. The honey of
flowers.
=Nectaries=, _n._ The receptacles in which the nectar of flowers is
collected; also the gland which secretes the nectar.
=Neptune=, _n._ In Roman mythology, the god of the sea.
=Nettle=, _n._ A weed armed with stinging hairs.
=Nitrogen=, _n._ A colorless, odorless, tasteless gas, forming about
three-fourths of the air and necessary to the formation of all
living bodies, whether plant or animal.
=Nitrogenous substances=, _n._ Substances in which nitrogen is one of
the constituents.
=Node=, _n._ L. _nodus_, a knot; the part of a stem which bears a leaf
or leaves. It is often a little larger than the rest of the stem.