The term 'ovum-to-be' refers to the process of oogenesis, which is the formation of an ovum or egg cell. OOTID is an acronym for ootid, which is a type of cell that develops from an OOCYTE (OOCYTE). Ootids are haploid cells that are formed during the early stages of oogenesis and eventually become an ovum. Oocytes are diploid cells that are produced in the ovaries and are the precursor to the ovum. The process of oogenesis involves the maturation of the OOCYTE, which then undergoes meiosis to form the ootid. The ootid then matures into an ovum, which is capable of being fertilized by a sperm cell.