Plants in which the seed sends up only a single seed-leaf (or cotyledon); characterised by the absence of consecutive layers of wood in the stem (endogenous growth), by the veins of the leaves being generally straight, and by the parts of the flowers being generally in multiples of three. (Examples, grasses, lilies, orchids, palms, etc. )

The accumulations of fragments of rock brought down by glaciers.

The law of form or structure independent of function.

- Stage : A stage in the development of certain crustaceans (prawns), in which they closely resemble the adults of a genus ( Mysis ) belonging to a slightly lower group.

Commencing development.