indexer

The word 'indexer' is a modern English agent noun formed from the root 'index'. The root 'index' itself has a rich history, entering English from Latin where index meant 'one who points out', 'discoverer', or 'informer', derived from the verb indicare ('to point out', 'declare'). This Latin verb is a compound of in- ('in, toward') and dicare ('to proclaim'). The suffix '-er', of Germanic origin, is a highly productive agentive suffix in English. Thus, an 'indexer' literally means 'one who points out or declares', which evolved into the modern sense of a person or system that systematically points to or lists information for reference.

Structure: index + er - index: From Latin index (indicator, forefinger, informer). Functions as the core root noun. - er: From Old English -ere, agent noun suffix. Functions as a suffix denoting a person or thing that performs an action.