• WordNet 3.6
    • adj semilunar resembling the new moon in shape
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Webster's Revised Unabridged Dictionary
    • a Semilunar Shaped like a half moon.
    • n Semilunar (Anat) The semilunar bone.
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Century Dictionary and Cyclopedia
    • semilunar Resembling a half-moon in form; half-moon shaped; loosely, in anat., bot., and zoology, crescentic in shape; crescentiform; meniscoid; concavo-convex: noting several structures, without much regard for precision in the implied meaning.
    • semilunar The lower concave border of the posterior layer of the sheath of the rectus muscle, lying about midway between the umbilicus and publis.
    • semilunar Same as rectovesical fold (which see, under rectovesical).
    • semilunar The interclavicular notch.
    • semilunar The suprascapular notch.
    • semilunar Synonyms Semilunar, Sigmoid. In anatomy, formerly (as still sometimes) these words described the same crescentic figure, for the reason that a later form of the Greek letter signia, Σ, was like a C. The two forms are distinguished in structures later named. Compare sigmoid (cavity of the ulna) with sigmoid (flexure of the rectum), under sigmoid, a.
    • n semilunar The semilunar or lunar bone of the wrist. See semilunare.
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In literature:

Displaced semilunar cartilage, and a three months' job.
"The Stark Munro Letters" by J. Stark Munro
Each valve has three folds, each half-moon-shaped, hence the name semilunar.
"A Practical Physiology" by Albert F. Blaisdell
At its point of insertion into the semilunar crest the tendon is severed and afterwards reflected.
"Diseases of the Horse's Foot" by Harry Caulton Reeks
The pupil is a fine black, and above each eye is a semilunar mark of the richest garnet.
"The Mirror of Literature, Amusement, and Instruction, Vol. 17, Issue 495, June 25, 1831" by Various
These valves are composed of semilunar folds of the tunica intima strengthened by an addition of connective tissue.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
The semilunar valves of the aorta.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce
The semilunar valves of the pulmonary artery and aorta were unusually small, and their bases cartilaginous.
"Cases of Organic Diseases of the Heart" by John Collins Warren
In man's eye is a minute membrane, the semilunar fold, which is absolutely useless in his economy.
"Man And His Ancestor" by Charles Morris
They are generally composed of two semilunar folds, one on each side of the vessel.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
The blow-hole is of a semilunar form, with a kind of valvular apparatus, and opens on the vertex, nearly over the eyes.
"The New Gresham Encyclopedia" by Various
KNOX, R., on the semilunar fold, i.
"The Descent of Man and Selection in Relation to Sex" by Charles Darwin
The openings of the arteries behind the semilunar valves may be very small.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield
The bones of the carpus are seven in number, the scaphoid and the semilunar being fused together.
"Artistic Anatomy of Animals" by Édouard Cuyer
How is the semilunar cartilage this morning?
"A Knight on Wheels" by Ian Hay
The shape was semilunar, crescentic or approximately that of the sector of a circle.
"The Aboriginal Population of the San Joaquin Valley, California" by Sherburne F. Cook