The Spanish word 'tolva', meaning 'hopper' (a funnel-shaped device used to feed materials into a machine), comes from Medieval Spanish 'tolba' with the same meaning. This derives from Latin 'tubula', meaning 'small trumpet', which is itself a diminutive form of Latin 'tubus' meaning 'tube, pipe'. The evolution from 'tubula' to 'tolva' shows interesting phonetic changes, where the 'u' became 'o' and the 'b' changed to 'v', while maintaining the basic concept of a hollow, tube-like structure used for directing materials.

The Spanish word 'tubo' (tube) is a related word that comes more directly from the same Latin root 'tubus'. While 'tubo' maintained its meaning as a general pipe or tube, 'tolva' specialized to refer specifically to a funnel-shaped hopper used for directing materials.

English speakers might recognize the connection to words like 'tube' and 'tubular', which come from the same Latin root 'tubus'. While these English words maintained the general meaning of a hollow cylinder, the Spanish 'tolva' evolved to describe a specific type of funnel-shaped tube used for industrial or agricultural purposes.