Tonnide

Tonnide is a term encountered as a unit of mass in some historical, regional, or fictional contexts. It is not an officially recognized unit in modern metrology, and no universal value is assigned to it.

Because tonnide has no standard definition, its magnitude varies by source. Some writers equate it with the metric tonne (1,000 kilograms), while others use much larger multiples or treat it as a generic large mass unit. In any case, the exact equivalence should be specified to avoid ambiguity.

Occurrences are most common in old nautical logs, regional measurement catalogs, or fictional worlds where authors seek a familiar yet nonstandard mass term.

Etymology and relation: the name combines ton with a suffix reminiscent of -ide; it is distinct from tonne (the SI unit of mass) and from tonnage (the capacity of a vessel or the aggregate mass carried).

See also: tonne, ton, tonnage.