-blast. A suffix meaning an immature precursor cell of the type indicated by the preceding word. [G. blastos, germ]. immature precursor cell type; the cell type is denoted by the preceding syllables, e.g. osteoblast.
(plural defining moments) A moment in time that defines something, such as a person's success or failure, achievement or demise, talent, etc. A point at which the essential nature or character of a person, group, etc., is revealed or identified.
Moment: Component of force perpendicular to the door multiplied by its distance from the pivot. When you push a door closed, it doesn't travel in a straight line-it turns around the hinges. This is an example of a moment (or torque). Try closing a door by pushing it at the handle.