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One of a peculiar kind of spines covering the surface of certain starfishes. They are pillarlike, with a flattened summit which is covered with minute spinules or granules. See Illustration in Appendix.

with dorsal spines of the cervical vertebræ, and helps to support the head. Called also paxywaxy and packwax.

See Paxwax.

ch influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis. --Pho`to*tac"tic (#), a. --Pho`to*tac"tic*al*ly, adv.

The order or arrangement of leaves on the stem; the science of the relative position of leaves.

A pick with a point at one end, a transverse edge or blade at the other, and a handle inserted at the middle; a hammer with a flattened end for driving wedges and a pointed end for piercing as it strikes. Shak.

A tablet; a register; hence, a list or scheme inscribed on a tablet. [R.] Sir T. Browne.

See Pneumothorax.

which air or other gas is present in the cavity of the chest; -- called also pneumatothorax.

Anciently, a kind of battle-ax with a long handle; later, an ax or hatchet with a short handle, and a head variously patterned; -- used by soldiers, and also by sailors in boarding a vessel.

A poleax. [Obs.] Chaucer.

Situated behind any transverse axis in the body of an animal; caudal; posterior; especially, behind, or on the caudal or posterior (that is, ulnar or fibular) side of, the axis of a vertebrate limb.

See Premaxilla.

An instrument, similar to the phenakistoscope, for presenting to view, or projecting upon a screen, images the natural motions of real objects.

se; practice; especially, exercise or discipline for a specific purpose or object. "The praxis and theory of music." Wood.

Occurring before the symptom ataxia has developed; -- applied to the early symptoms of locomotor ataxia.

Situated in front of any transverse axis in the body of an animal; anterior; cephalic; esp., in front, or on the anterior, or cephalic (that is, radial or tibial) side of the axis of a limb.

he nose and mouth, forming the anterior part of each half of the upper jawbone; the intermaxilla. In man the premaxillæ become united and form the incisor part of the maxillary bone.

Situated in front of the maxillary bones; pertaining to the premaxillæ; intermaxillary. -- n.

The art of preserving from, or of preventing, disease; the observance of the rules necessary for the preservation of health; preservative or preventive treatment.