The word 'usurer' has a direct lineage from the Latin usura, meaning 'use' or specifically 'interest paid for the use of money'. The core Latin root us- (from uti, 'to use') evolved to denote the financial concept of 'interest'. The Latin agent noun usurarius (money-lender) was formed by adding the agent suffix -arius to usura. This entered Middle English via Anglo-Norman French as 'usurier'. The modern English spelling 'usurer' reflects a re-Latinization and the addition of the redundant but common English agent suffix '-er', solidifying its meaning as 'one who charges interest'. Thus, the term's logic moves from the general concept of 'use' to the specific, often pejorative, modern sense of one who profits excessively from lending.

Structure: us (use) + ur (agent suffix) + er (agent suffix) - 'us': From Latin usus (use, employment, benefit, interest on money). Functional role: core root conveying the concept of use or interest. - 'ur': A Latin agent suffix -or, indicating a person or thing that performs an action. Functional role: agentive suffix. - 'er': An English agent suffix, reinforcing the agentive meaning. Functional role: agentive suffix.