Definition
An archaic Law French term meaning "to aid" or "to help." Appearing in medieval English legal texts, *eyder* functioned as a verb expressing the concept of legal assistance or relief — particularly the act of helping oneself through available legal mechanisms such as exceptions or pleas. The term also appears in oath formulations, as in the invocation "so help me God and his saints," rendered in Law French as *si moy eyde Dieu et ses seyntz*.
Common Language
Modern common usage (Wiktionary): No entry. The term does not appear in modern general English usage.
Historical common usage (Webster's 1913): No entry. The term was already obsolete in common English by the nineteenth century.
Editorial note: *Eyder* is not a survival in ordinary English. Its cognate "aid" persists in both common and legal English, but *eyder* itself is a relic of the Law French register used in medieval English courts and legal texts. Researchers encountering it should treat it as a specialist historical term, not a variant spelling of anything in current use.
Common Confusion
*Eyder* should not be confused with the modern legal term "aid" as used in statutes or equitable doctrine, nor with "aider" in the sense of one who assists in the commission of a crime. The resemblance is etymological only. The word also bears no relation to the common English noun "eider" (a species of duck). Researchers working in medieval or early modern sources may also encounter variant spellings — *eide*, *eyder*, *ayder* — reflecting the orthographic instability of Law French as recorded in English manuscripts.
Why It Matters in Research
This term matters primarily to researchers working in medieval English legal sources — Year Books, Britton, Bracton, Fleta, and related texts — where Law French was the operative language of pleading and judicial record. *Eyder* appears in contexts where a party is described as having recourse to a procedural device: the formulation *se purra il eyder par excepcions* ("he may help himself by exceptions") is a compressed statement of pleading right, not a general expression of sympathy or assistance.
The oath fragment — *si moy eyde Dieu et ses seyntz* — is historically significant as an early documented form of the judicial oath, linking divine invocation to the act of sworn testimony. Researchers tracing the history of oath administration, perjury doctrine, or the evidentiary role of religious sanction in English courts will find this formulation a useful data point.
Two practical traps await the unwary researcher. First, Law French orthography varies substantially across manuscripts and printed editions of early legal texts; *eyder* may appear in forms that are not immediately recognizable as the same word. Second, later English legal writers who quoted or paraphrased medieval sources sometimes silently translated *eyder* into English "aid" or "help," stripping the Law French context and obscuring the connection to the original formulation.
This term has no living procedural or substantive meaning. It should not be imported into analysis of modern doctrine.
Historical Dictionary Support
Burrill's Law Dictionary is the principal source for this term in the Law Mind corpus. Burrill correctly identifies the Law French origin and provides two illustrative quotations from Britton, an Anglo-Norman legal treatise of the late thirteenth century. The first quotation — *se purra il eyder par excepcions* — situates the term in the context of procedural self-help through exceptions. The second — *si moy eyde Dieu et ses seyntz* — places it in oath administration.
No modern legal dictionary treats *eyder* as a live term, and rightly so. Historical dictionaries of Law French, including those appended to early editions of Britton and to Rastell's legal terms collections, cover this vocabulary more thoroughly than general English legal dictionaries. Researchers needing fuller treatment of Law French legal vocabulary should consult specialized glossaries of Anglo-Norman legal language rather than relying on general legal dictionaries, which typically omit or abbreviate entries of this kind.
Jurisdictional Note
This term is specific to the historical English common law tradition. It has no independent development in civil law jurisdictions, Scottish law, or American legal usage beyond antiquarian reference.