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Same as Hæmatoblast.

Blood formative; -- applied to a substance in early fetal life, which breaks up gradually into blood vessels.

Same as Hæmatoplastic.

The act or process of repairing lesions made by ulcers, especially by a plastic operation.

An abnormal formation foreign to the economy, and composed of elements different from those are found in it in its normal condition. Dunglison.

Producing a different type of organism; developing into a different form of tissue, as cartilage which develops into bone. Haeckel.

Having a single series of large scutes on the posterior side of the tarsus; -- said of certain birds.

an ovum composed entirely of germinal matter. See Meroblast.

entirely of germinal matter, the whole of the yolk undergoing fission; -- opposed to meroblastic.

Resemblance between different plants or animals, in external shape, in general habit, or in organs, which is not due to descent from a common ancestor, but to similar surrounding circumstances.

One of the plastids composing the idorgan of Haeckel; -- also called homoörgan.

Of or pertaining to homoplasty; as, homoplasticorgans; homoplastic forms.

The formation of homologous tissues.

See Homogeny.

See under Blast.

An instrument for measuring time, especially the interval of an hour. It consists of a glass vessel having two compartments, from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower.

The fluid portion of the cell protoplasm, in opposition to stereoplasm, the solid or insoluble portion. The latter is supposed to be partly nutritive and partly composed of idioplasm.

An increase in, or excessive growth of, the normal elements of any part.

Of or pertaining to hyperplasia.

The inner or lower layer of the blastoderm; -- called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm.