Thomas Wright Moir Cameron, 86, professor emeritus of parasitology at McGill University in Montreal, Canada, died Tuesday at Montgomery General Hospital in Olney, Md., after a stroke.

He had resided in Rossmoor Leisure World in Silver Spring for the last three years.

Dr. Cameron retired as a professor at McGill 11 years ago. He was founder of the Institute of Parasitology, associated with the university, in 1932 and remained its director until 1964.

He was born in Glasgow, Scotland. He was educated at Glasgow University; Edinburgh University, where he earned a doctorate; London University, and the Royal (Dick) Veterinary College in Edinburgh.

During World War I, Dr. Cameron served with the Royal Flying Corps.

Before going to Canada, he taught at the London School of Hygiene and Tropical Medicine.

He was the author of numerous publications on parasites and the diseases of animals in relation to man. He was a fellow of a number of societies, including the Royal Society of Tropical Medicine and Hygiene, the World Federation of Parasitologists and the American Society of Parasitologists, of which he was a former president. He had been chairman of the Canadian Committee of the International Biological Programme.

A former editor of the Canadian Journal of Zoology, Dr. Cameron had received the Order of Canada and the Territorial Decoration.

He is survived by his wife, Stella B., of Rossmoor Leisure World; a daughter, Adrienne Boniface, of Washington, three grandchildren and two great-grandchildren.