Tra·cy 
(trāsē), Spencer 1900-1967.
(trāsē), Spencer 1900-1967. American actor known for his film partnership with Katharine Hepburn and for his Academy Award-winning performances in Captains Courageous (1937) and Boys Town (1938).
- microRNA
- microsatellite
- microscope
- microscopic
- microscopical
- microscopically
- microscopist
- Microscopium
- microscopy
- microsecond
- microseism
- microseismic
- microsensor
- microsleep
- microsomal
- microsome
- microsomic
- microsporangiate
- microsporangium
- microspore
- microsporic
- microsporocyte
- microsporogenesis
- microsporophyll
- microsporous