The Spanish word 'madre' meaning 'mother' comes from the Vulgar Latin word 'matre', which itself developed from the Classical Latin word 'mater'. This evolution shows a typical pattern of sound changes from Latin to Spanish, where the medial 't' became voiced to 'd' and the final '-er' evolved to '-re'.

Several Spanish words are derived from 'madre', including 'madrina' (godmother), 'madrastra' (stepmother), and the affectionate term 'madrecita' (dear mother). The word also appears in many Spanish expressions, like 'lengua madre' (mother tongue) and 'tierra madre' (motherland).

The English words 'maternal', 'maternity', and 'matriarch' all share the same Latin root 'mater' with Spanish 'madre'. You can see this connection in words like 'maternal instinct' or 'maternity ward'. Even the word 'mother' itself, though it comes from Germanic rather than Latin roots, is distantly related, as both derive from the same ancient Indo-European root meaning 'mother'.