keyhole


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keyhole

1. an aperture in a door or a lock case through which a key may be passed to engage the lock mechanism
2. a transient column of vapour or plasma formed during the welding or cutting of materials, using high energy beams, such as lasers
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

keyhole

[′kē‚hōl]
(design engineering)
A hole or a slot for receiving a key.
(metallurgy)
A welding method wherein the heat source, because of its concentration, causes a hole through the surface immediately ahead of the molten weld metal in the direction of welding; the hole is filled as the welding progresses, ensuring complete joint penetration.
(ordnance)
Of a bullet, to strike a target after tumbling in flight so that the long axis of the bullet and the line of flight are not the same; usually caused by failure of the bullet to receive sufficient spin from the rifling in the barrel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Consultant general surgeon Mr Ablorsu explained: "To repair the groin hernia, when the keyhole technique is used, the defect or hole is covered with a mesh from within the abdomen and this prevents reoccurrence in the future.
Former LFC striker Michael Owen's home featured on Through The Keyhole Pictures: ITV
I would say keyhole surgery isn't what it was cracked up to be and in your position I would opt for a radical hysterectomy done through open surgery.
All Keyhole events include time for advanced Q&A between the audience and Keyhole Software experts on the topic.
The review covered basic analytical solutions, such as a moving/fixed-point heat source combined with a line source of heat, along with numerical solutions, including standard heat transfer solutions, welding dissimilar metals, multipass welding, melt-pool models, and keyhole models.
The concept of keyhole microsurgery was introduced in 1971 by Wilson, who advocated using microsurgical techniques to refine conventional microsurgery approach.
In previous papers, we have measured the keyhole effect on a railway tunnel and related its probability to the cross section of the tunnel [9] as well as to the polarization setup [10].
The workshop is demonstrating different kinds of new keyhole surgery techniques in the field of gynaecology, bariatric surgery, gastroenterology, urology, oncology and general surgery.
JUST a fortnight before having major keyhole surgery to repair a heart valve, Kevin Johnson was enjoying a holiday in the South of France with wife Bobbie.
Katayama and Matsunawa [5] studied the porosity formation and prevention mechanism during high-power C[O.sub.2] laser welding and YAG laser welding and found that many bubbles were intermittently formed mainly from the bottom tip of the keyhole. Some bubbles floated up and disappeared from the top surface and the amount of porosity was reduced, while others were captured at the solidifying front in the rear part of the molten pool, resulting in the formation of pores.
Utilicor Technologies' new MC-450 Minicor Coring Attachment is a powerful keyhole coring attachment built for utility contractors looking to perform quick and efficient pavement core cuts.
Summary: Doctor found on internet saves woman's life by removing monster fibroid through keyhole surgery