Definition
An obsolete unit of dry measure used in old English and Scots law. In English usage, an oceldra corresponded to the chaldron (also spelled chalder), a volumetric unit applied primarily to the measurement of grain and, in later English practice, coal. In old Scots law, the term was used interchangeably with "chalder" as a measure of grain.
The precise volume denoted by an oceldra varied by period, locality, and commodity — a characteristic instability common to pre-metric measures throughout medieval and early modern law.
---
Why It Matters in Research
Researchers will encounter this term almost exclusively in medieval English land records, Scottish agricultural documents, estate instruments, and early commercial contracts involving grain or similar commodities. Its significance is almost entirely historical: no modern legal system employs the oceldra as a unit of measure, and the term does not appear in modern statutory or case law.
The primary research trap is terminological fragmentation. The same underlying measure appears across historical sources as oceldra, chaldron, chalder, and chaldar, with spelling varying by scribe, century, and jurisdiction. A search limited to one spelling will miss cognate appearances. When interpreting a historical document that references an oceldra, the researcher must also consult the specific jurisdiction's local customs for the period in question, as the actual volume represented was not fixed.
Scottish sources require particular care. The Scots chalder was not identical to the English chaldron in all periods, and the two systems diverged meaningfully in practice. Kames's Equity (cited in Black's) provides a period reference point for the Scots usage, and researchers working with Scottish estate or agricultural records should treat it as a starting reference rather than a definitive conversion table.
When this term appears in a legal dispute — typically involving inheritance, rent in kind, tithes, or agricultural tenancy — the central question is usually what volume the parties actually intended. That inquiry requires resort to local custom, contemporary glossaries, and period agricultural records rather than modern legal dictionaries.
---
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) is the sole historical dictionary source for this term in the Law Mind corpus. Black's entry is brief but functionally complete for its purpose: it identifies the term as an old English and Scots measure, equates it with the chaldron/chalder, and cites Kames's Equity for Scots law authority.
What Black's does not provide — and what no single dictionary entry can — is a fixed volumetric equivalent. Historical scholarship on weights and measures confirms that the chaldron family of measures was notoriously variable. In English coal trade law, the chaldron was eventually standardized by statute, but for grain and in Scottish practice the figure remained subject to local variation well into the modern period. Researchers should not infer a single conversion factor from the Black's entry alone.
No other historical legal dictionary in the Law Mind corpus separately addresses oceldra. The term's absence from later editions of Black's and from other standard legal dictionaries reflects its status as a pure archaism with no continuing legal application.
---
Jurisdictional Note
The term carries distinct English and Scots lineages that should not be conflated. English usage connects to the chaldron as standardized (eventually) in English trade and revenue law; Scots usage connects to the chalder as applied in Scottish agricultural tenancy and estate practice. Documents from each jurisdiction require independent verification of the applicable measure.
---