-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.
It's the defining moments that will influence what kind of company you choose to start, what art you'll make, what book you'll write. Who you'll fall in love with, and why. Where you'll live, and when. If you could recognise, while in the middle of them, every single defining moment of your life, it's possible you could learn a little more. Or appreciate them, for what they are. But that's not the way life works. All you can do is let the moments come. Let them happen, let them influence, and try to learn as often as you can. Look back. Look back regularly. Like a ship coming in on the horizon, your defining moments may slowly become visible.