-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.
The calculation of moments is so basic to the engineering process it is required for members, walls, foundations and even entire buildings. Reaction :: This is a fancy way of referring to the amount of weight an element contributes to a particular location.