heirloom is a compound of heir and loom; loom here is the archaic word for a tool or implement (Old English gelōma 'utensil'), so an heirloom is a chattel that passes to the heir along with the estate. Morphologically, the word is best read through the components named in the history, with the modern spelling preserving a compound structure rather than a single unanalyzable stem. In present English, the noun sense is "a valued object passed down through generations of a family", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as heir, loom, inherit, and heritage. Its semantic neighborhood includes keepsake, legacy, inheritance, and relic, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin heres and Old English gelōma.