A first sergeant; Top-Kick (1940s+ Army)
noun 1. the officer of a merchant vessel next in command beneath the captain. noun 1. an officer second in command to the captain of a merchant ship Also called first officer
noun, Biochemistry. 1. a hormone that triggers a biochemical reaction at a site removed from its release.
- First minister
noun 1. the chief minister of the Northern Ireland Assembly 2. the chief minister of the Scottish Government
- First molar
first molar n. The sixth permanent tooth or fourth deciduous tooth in the upper and lower jaw on either side.