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A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus.

shrubs, found in Australia and the South Sea Islands, and having very hard wood. Metrosideros vera is the true ironwood.

A one-horned creature; a unicorn; a sea monster with one horn. Mighty monoceroses with immeasured tails. Spenser.

Fond of woman. [R.] Charles Reade.

A fondness for women. [R.] Dr. H. More.

Rhythm; harmony; flow. [Obs.] The numerosity of the sentence pleased the ear. S. Parr.

Wrought with labor; requiring labor; hence, tedious; wearisome. "Operose proceeding." Burke. "A very operose calculation." De Quincey. -- Op"er*ose`ly, adv. -- Op"er*ose`ness, n.

Laboriousness. [R.] Bp. Hall.

Abnormal hardness and density of bone.

A tribe of Indians inhabiting the pampas of South America.

ality or state of being ponderous; weight; gravity; heaviness, ponderousness; as, the ponderosity of gold. Ray.

An extinct genus of reptiles of the Permian period. Called also Protosaurus.

A pterodactyl.

An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; -- called also Pterodactyli, and Ornithosauria.

Of or pertaining to the Pterosauria.

A thickened opaque spot on the wings of certain insects.

Any pachyderm belonging to the genera Rhinoceros, Atelodus, and several allied genera of the family Rhinocerotidæ, of which several living, and many extinct, species are known. They are large and powerful, and usually have either one or two stout conical median horns on the snout.

Affected with sclerosis.

Hardening of the cell wall by lignification. Cerebro-spinal sclerosis (Med.), an affection in which patches of hardening, produced by increase of the neuroglia and atrophy of the true nerve tissue, are found scattered throughout the brain and spinal cord. It is associated with complete or partial paralysis, a peculiar…

That part of the skeleton which is developed in tendons, ligaments, and aponeuroses.