| impression | 1. The act of impressing, or the state of being impressed; the communication of a stamp, mold, style, or character, by external force or by influence. 2. <dentistry> The first step in making a model of your teeth. You bite into a container filled with algenate, and the algenate hardens to produce a mold of your teeth. 3. That which is impressed; stamp; mark; indentation; sensible result of an influence exerted from without. "The stamp and clear impression of good sense." (Cowper) "To shelter us from impressions of weather, we must spin, we must weave, we must build." (Barrow) 4. The pressure of the type on the paper, or the result of such pressure, as regards its appearance; as, a heavy impression; a clear, or a poor, impression; also, a single copy as the result of printing, or the whole edition printed at a given time. "Ten impressions which his books have had." (Dryden) Origin: F. Impression, L. Impressio. (27 Oct 1998) |
|---|---|
| impression area | In dentistry, that surface which is recorded in an impression. (05 Mar 2000) |
| impression compound | A thermoplastic material usually composed of gum damar and prepared chalk, used especially for making dental impressions. Synonym: impression compound, modeling composition, modeling compound. (05 Mar 2000) |
| impression for costoclavicular ligament | <anatomy> An irregular pitted area on the inferior surface of the clavicle at its sternal end, giving attachment to the costoclavicular ligament. Synonym: impressio ligamenti costoclavicularis, costal tuberosity, rhomboid impression, tuberositas costalis. (05 Mar 2000) |
| impression material | Any substance or combination of substances used for making a negative reproduction or impression. (05 Mar 2000) |
| oesophageal impression | The marking of the oesophagus on the back of the left lobe of the liver. Synonym: impressio oesophagea. (05 Mar 2000) |
| trigeminal impression | A depression on the anterior surface of the petrous portion of the temporal bone, near the apex, lodging the trigeminal ganglion. Synonym: impressio trigeminalis. (05 Mar 2000) |
| final impression | In dentistry, the impression that is used to make the master cast. (05 Mar 2000) |