-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.
Definition of climax for English Language Learners. : 1  the most exciting and important part of a story, play, or movie that occurs usually at or near the end. : 2  the most interesting and exciting part of something : the high point. : 3  the most intense point of sexual pleasure.