epiphysis

Definitions

  • WordNet 3.6
    • n epiphysis a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin
    • n epiphysis the end of a long bone; initially separated from the main bone by a layer of cartilage that eventually ossifies so the parts become fused
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Webster's Revised Unabridged Dictionary
    • n Epiphysis (Anat) The end, or other superficial part, of a bone, which ossifies separately from the central portion, or diaphysis.
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Century Dictionary and Cyclopedia
    • n epiphysis In anatomy: A part or process of bone which has its own center of ossification separate from the main center of the shaft or body of the bone, and which therefore only gradually joins the rest of the bone by the progress of ossification: so called because it grows upon the body of the bone. Thus, the end of a long bone, as the humerus or femur, has for a while a gristly cap of cartilage, which ossifies separately from one or several ossific centers, and finally coössifies with the shaft. An epiphysis is properly distinguished from an apophysis, or mere bony process or outgrowth without independent ossific center, being always autogenous or endogenous, and not merely exogenous; but the distinction is not always observed, especially as a completed and coossified epiphysis cannot be recognized as such with certainty. See cut under endoskeleton.
    • n epiphysis Some part or organ that grows upon or to another.
    • n epiphysis A small superior piece of each half of an alveolus of a sea-urchin, united below to its own half of the alveolus, joined to its fellow of the other half of the same alveolus, and connected by the rotula with the epiphysis of another alveolus. See lantern of Aristotle, under lantern.
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Chambers's Twentieth Century Dictionary
    • n Epiphysis ep-if′i-sis any portion of a bone having its own centre of ossification: the pineal gland: a small upper piece of each half of an alveolus of a sea-urchin
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Etymology

Webster's Revised Unabridged Dictionary
NL., fr. Gr. 'epi`fysis, fr. 'epify`ein to grow upon; 'epi` upon + fy`ein to grow
Chambers's Twentieth Century Dictionary
Gr.

Usage

In literature:

The activity of the epiphysial cartilage may be modified as a result of disease.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
The stoppage of the fissuring short of the epiphysis is characteristic.
"Surgical Experiences in South Africa, 1899-1900" by George Henry Makins
Epiphysis: a lappet-like process covering an excavation on the fore tibia of many Lepidoptera.
"Explanation of Terms Used in Entomology" by John. B. Smith
Impairment of growth and eventual shortening of the limb may result from involvement of an epiphysial junction.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition." by Alexander Miles
The most frequent site of fracture, or separation of the epiphysis, is the lower end of the femur.
"Scurvy Past and Present" by Alfred Fabian Hess
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