-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.
If one chooses to define the magnetic moment as the maximum torque experienced in unit external magnetic field, there is still a choice as to whether by magnetic field we choose H or B. Thus we could define magnetic moment by either of the following two equations: Ï = p 1 H 17.5.1 or Ï = p 2 B.