+onychauxis.+ Enlargement of finger or of toe nails. +onychia.+ Inflammation of the matrix with suppuration and shedding of the nail. +onychocryptosis.+ Ingrowing toe-nail. +onycholysis.+ Loosening or shedding of the nails. +onychomalacia.+ Loss or absence of nail rigidity. +onychomycosis.+ Any parasitic disease of the nails. +onychophag.+ One whose habit it is to bite his finger-nails. +onychophagy.+ Nail-biting. +onychoptosis.+ Falling off of the nails. +onychorrhexis.+ Abnormal brittleness of the nails. +onyx.+ A finger nail or a toe nail. +onyxis.+ Ingrowing toe-nail. +opisthotonos.+ Spasmodic rigidity of the body in which the trunk is thrown backward and arched upward. +oral.+ Relating to the mouth. +organic.+ Pertaining to or having organs, exhibiting animal or vegetable characteristics. +orthoform.+ A white, odorless, crystalline powder; employed as a local anesthetic and antiseptic in burns, ulcers, etc. +orthopedics.+ That branch of surgery which treats of chronic diseases of the joints and spine and the correction of deformities. (See chiropodial orthopedics.) +os (plural ossa).+ Bone. +osis.+ Full of, as in tuberculosis, a specific disease caused by the presence of the bacillus tuberculosis. +osseous.+ Bony. +osmidrosis.+ Bromidrosis; the excretion of perspiration of a strong odor. +ossification.+ The formation of bone. +osteitis.+ Inflammation of bone. +osteoclast.+ A polynuclear cell concerned in the absorption of bone. +osteogenetic.+ The development and formation of bone. +osteoma.+ A bony tumor. +osteomalacia.+ Softening of the bone. +osteomyelitis.+ Inflammation of the bone marrow or of both marrow and bone. +ous.+ Full of, as in fibrous, full of or composed of fibres. +oxygen.+ A gaseous element, the most widely distributed. Essential to animal and plant life; symbol O. +ozone.+ A modified form of oxygen. +P+ +pachylosis.+ Thick, dry and abnormal quality of skin which cracks into scales of irregular form. +pack.+ The process of enveloping a patient in a wet sheet or blanket. Cold pack: in sheets wrung out of water; hot pack: in sheets wrung out of hot water; dry pack: in dry warmed blankets, etc. +pachyacria.+ Bulbous thickening of the extremities of the fingers or toes. +pachydermia.+ Thick skin; elephantiasis. +palliative.+ Mitigating; lessening the severity. +palm.+ The flat of the hand. +palpation.+ Exploration with the hand. +panidrosis.+ Sweating from all parts of the skin. +papilla.+ Any small nipple-like process. +papilloma.+ A growth of hypertrophied papillae of the skin. +papule.+ A small circumscribed elevation of the skin, containing no fluid. A pimple. +paralysis.+ Loss of power of voluntary movement in a muscle through injury or disease of nerve supply. +parasite.+ An organism that inhabits another organism and obtains nourishment from it. +paresis.+ General paralysis of the insane or dementia paralytics. A condition thought to be due to a chronic meningitis.