-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.
A moment is force times the perpendicular distance from the fulcrum to the line of action of the force. The epidemiologist and poet Miroslav Holub developed an attractive theory in his collection of essays The Dimension of the Present Moment (1990).