The Spanish word 'parto' (meaning 'childbirth') comes from the Latin noun 'partus' meaning 'birth' or 'offspring'. This Latin noun was derived from the supine form 'partum' of the Latin verb 'parere', which meant 'to give birth' or 'to produce'. The evolution from Latin to Spanish maintained the core meaning related to childbirth while simplifying the word's form.

Some related Spanish words include 'parir' (to give birth), 'partera' (midwife), and 'parturienta' (woman in labor). All these words share the same Latin root 'parere' and maintain meanings connected to childbirth and reproduction.

While English doesn't have many common direct descendants from Latin 'parere', we do see this root in some scientific or medical terms. For example, 'parturition' (the action of giving birth), 'postpartum' (after childbirth), and 'viviparous' (giving birth to live young). The prefix 'primi-' combined with this root gives us 'primiparous', meaning someone giving birth for the first time.