Human beings are usually uniparous, though they occasionally have twins, triplets, or even more babies at once. You're most likely to come across a description of an animal as uniparous in a zoology class, although it's sometimes used to describe a woman who has only had one child in her lifetime. In either case, the prefix uni, or "one" in Latin, gives a clue to the word's meaning. Parous comes from the Latin parere, "to produce or bring forth."