-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.
n. 1  a short indefinite period of time: he'll be here in a moment. 2  a specific instant or point in time: at that moment the doorbell rang. 3  the moment â the present point of time: at the moment it's fine.  import, significance, or value: a man of 1  moment. a tendency to produce motion, esp rotation about a point or axis.