Definition of natural
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Lern More About Natural
Irritability ::
Irritability (n.) A
natural susceptibility, characteristic of all
living organisms, tissues, and
cells, to the
influence of
certain stimuli, response being
manifested in a
variety of ways, -- as that
quality in
plants by which they
exhibit motion under
suitable stimulation; esp., the
property which
living muscle processes, of
responding either to a
direct stimulus of its
substance, or to the
stimulating influence of its nerve
fibers, the
response being
indicated by a
change of form, or
contracti
Organ ::
Organ (n.) A
natural part or
structure in an
animal or a
plant, capable of
performing some
special action (termed its
function), which is
essential to the life or
well-being of the
whole; as, the
heart, lungs, etc., are
organs of
animals; the root, stem,
foliage, etc., are
organs of
plants..