n. [ Hyper- + metamorphosis. ] (Zool.) A kind of metamorphosis, in certain insects, in which the larva itself undergoes remarkable changes of form and structure during its growth. [ 1913 Webster ]

n.; pl. Metamorphoses [ L., fr. Gr. &unr_;, fr. &unr_; to be transformed; meta` beyond, over + morfh` form. ] [ 1913 Webster ]

1. Change of form, or structure; transformation. [ 1913 Webster ]

2. (Biol.) A change in the form or function of a living organism, by a natural process of growth or development; as, the metamorphosis of the yolk into the embryo, of a tadpole into a frog, or of a bud into a blossom. Especially, that form of sexual reproduction in which an embryo undergoes a series of marked changes of external form, as the chrysalis stage, pupa stage, etc., in insects. In these intermediate stages sexual reproduction is usually impossible, but they ultimately pass into final and sexually developed forms, from the union of which organisms are produced which pass through the same cycle of changes. See Transformation. [ 1913 Webster ]

3. (Physiol.) The change of material of one kind into another through the agency of the living organism; metabolism. [ 1913 Webster ]

Vegetable metamorphosis (Bot.), the doctrine that flowers are homologous with leaf buds, and that the floral organs are transformed leaves. [ 1913 Webster ]