-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.
1. a: something that is conveyed as a meaning often obscurely or indirectly b: the quality of conveying or implying. 2. a: the quality of being important: moment b: the quality of being statistically significant. See significance defined for English-language learners.