ˈaɪərɪs n. 1
the flat
circular coloured membrane behind the
cornea of the
eye,
with a circular
opening (pupil) in the
centre. 2
any herbaceous plant of the
genus Iris, usu. with
tuberous roots, sword-shaped
leaves,
and showy flowers. 3 (in full iris diaphragm) an adjustable
diaphragm of
thin overlapping plates
for regulating the size of a
central hole esp. for the
admission of
light to a
lens. [ME f. L iris iridis f. Gk iris iridos
rainbow, iris]