Category: D

The product of cleaving a polynucleotide.  

A phylum of the kingdom Protista; photosynthetic unicellular organisms that are part of the phytoplankton in fresh and ocean water. Some marine species bloom explosively in what are called “red tides”; shellfish that feed on the dinoflagellates are toxic to humans (paralytic shellfish poisoning). Another species produces ciguatera toxin, which is poisonous to fish and…

The formation of slight depressions in the flesh due to retraction of the subcutaneous tissue. It occurs in certain carcinomas, such as cancer of the breast.  

A sign used to differentiate a benign lesion, dermatofibroma, from nodular melanoma, which it may mimic. On application of lateral pressure with the thumb and index finger, the dermatofibroma dimples or becomes indented; melanomas, melanocytic nevi, and normal skin protrude above the initial plane.  

A small depression in the skin, especially of the cheek or chin.  

An exceptionally toxic form of mercury that may cause disease and death even after minute exposures. It is readily absorbed through the skin and respiratory tract.  

A malodorous product of decay of materials that contain proteins.  

An artificial penis-shaped device to simulate sexual intercourse.  

Dilatation of an opening or a cavity by use of the fingers.  

A tumor of the ciliary epithelium.