| coin |
A piece of metal (usually round) with a distinctive stamp and of a fixed value and weight issued by an authority and intended to be used as a medium of exchange.
출처: www.coin-gallery.com/cgglossary.htm
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| coitus interruptus |
Withdrawal of the penis from the vagina just before ejaculation. It is thought to be the oldest method of contraception and is mentioned in the Book of Genesis. The method is not reliable (failure rate is above 15%) because small amounts of sperm containing seminal fluid may be emitted before full sensation leading to ejaculation is felt. Unwanted conceptions may carry the risk of conflict, resentment and prenatal/postnatal neglect. ...
출처: www.biol.tsukuba.ac.jp/~macer/biodict.htm
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| coil |
In model railroading, a tightly wound "spool" of thin wire which is a component of electrical devices such as solenoids and electromagnets.
출처: www.lionel.com/GettingStarted/Guides/a-f.html
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| coil spring |
a bar of resilient metal wound into a spiral that may be compressed or extended without permanent deformation. Coil springs have many automotive applications but are particularly important as suspension springs.
출처: www.autocenter.com/about/
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| coin |
object usually made of flat metal, small and round. Issued by a government as money. Usually, accepted by community as having value.
출처: cointerms.hypermart.net/c.htm
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