McGraw-Hill Professional, 2008.
A South American herb (Nicotiana tabacum) whose leaves contain 2 to 8 percent nicotine and serve as the source of both smoking and smokeless tobacco and the basis of great health hazards.
- Tobacco smoking
The direct inhalation of tobacco smoke, the basis of major health hazards. Long known to cause cancer in humans, tobacco smoking is generally held to be the leading preventable cause of cancer in developed countries. Tobacco smoking was formally classified as a “known human carcinogen” by the US government in 2000.
- Toc- (prefix)
Stemming from the Greek word “tokos” meaning childbirth, we have toc-, toco-, tok-, and toko- as combining forms, all referring to labor or childbirth.
Prefix meaning childbirth. For example, tocolysis is the slowing or halting of labor. Sometimes spelled tok-, toko-.
The slowing or halting of labor during the birth process.