foreign matter

We must keep to the text and not resort to any foreign matter to help the feeble memory.

Before passing into the pump again the oil is strained or filtered by a screen of wire gauze and all foreign matter removed.

Whenever a string had to be tightened by either, Sally introduced foreign matter.

Why should I thus introduce foreign matter into 237 the delicate cogwheels of my programme of reading?

On leaving the loom the cloth is first washed in soap and water to remove any dirt or other foreign matter it may contain.