pinhole

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pinhole

(pĭn′hōl) [AS. pinn, pin, + hol, hole]
A small perforation made by, or the size of that made by, a pin.

pinhole os

A very small opening to the uterus from the vagina. It may be present in very young women.
References in periodicals archive ?
The biggest problem with a pinhole projector is that the image is small and dim.
Low Voltage Pinhole Detector-Advanced (LD8105) comes in a hardboard box with the following items: Low Voltage Pinhole Detector, Sponge Wand, grounding cable with clamp and user manual.
As pinholes in aluminum are very rare, it is correspondingly difficult to find test samples that can be used to measure the influence of aluminum pinholes.
If they look deep, the next step usually is to cross section a few pinholes and look at them under a higher power microscope (100-400X).
instead small pinholes at the agglomerate sites are observed after prolonged exposure of samples to humidity.
To test if the students' cameras are light safe, I give each student a small piece of photo paper and have them seal their cameras and cover their pinholes.
This is accomplished by collecting emission photons that normally are rejected by the emission side pinhole, traditionally used at the 1 airy disk size.
If both pinholes are open and some of the waves coming from pinhole 1 cross-interfere with waves coming from pinhole 2 in the space before the lens, there will remain a contribution by pinhole 2 at image 1 that will compensate exactly the decrease of quantum waves contributed by pinhole 1 at image 1.
She left scores of cans containing film and pinholes scattered around Newcastle's Bigg Market and the Quayside in an exercise to capture impressions of Newcastle at night.
Pinholes -- What might be causing pinholes on 20-lb bag paper?