impression

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Related to impression smear: impression surface

impression

Dentistry an imprint of the teeth and gums, esp in wax or plaster, for use in preparing crowns, inlays, or dentures

impression

[im′presh·ən]
(geology)
A form left on a soft soil surface by plant parts; the soil hardens and usually the imprint is a concave feature.
(graphic arts)
A print made from an engraved plate.
A press run or printing of a book.
(metallurgy)
A machined cavity in a forging die for production of a specific geometric shape in the workpiece.

impression

An advertisement on a Web page. If ads on the Web are not based on a click-through rate (CTR), they are typically sold on a cost per thousand (CPM) basis. One impression is one banner ad displayed on one page. Also called a "view" or "ad view." See banner ad, interstitial ad, pay-per-click and click-through rate.
References in periodicals archive ?
Impression smears from the liver, spleen, lungs, and rectum were prepared and stained with a quick stain (Hemacolor, Merck, Darmstadt, Germany).
The second chapter describes diagnostic techniques, such as feather examination, pulp cytology, tape strip examinations, impression smears, and skin biopsy.
Immunofluorescence tests with antirabies conjugate prepared to be cross-reactive with the African rabies related viruses (Onderstepoort Veterinary Institute, Pretoria, South Africa) showed small and sparse inclusion bodies in impression smears of the cortex, hippocampus, thalamus, medulla, and cerebellum.