-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.
moment of inertia - the tendency of a body to resist angular acceleration. inertia - (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force. moment - a turning force produced by an object acting at a distance (or a measure of that force)