Definition
In Roman and civil law, a tegula is a roof tile. The term appears in Roman legal sources in the context of property transactions, construction obligations, and disputes involving building materials. As a matter of Roman law, tiles were considered among the materials that could be attached to or severed from a structure, raising questions about whether they formed part of an immovable property or remained separately alienable goods.
Common Language
Modern common usage (Wiktionary): A flat Roman roof tile with raised edges, joined together by an imbrex; also a small sclerite on insect wings; also a genus of sea snail.
Historical common usage (Webster's 1913): A small appendage situated above the base of the wings of Hymenoptera, attached to the mesonotum.
The legal meaning tracks the architectural sense closely — a roof tile — rather than the entomological or zoological senses. There is no meaningful gap between the Roman legal meaning and the architectural common meaning; the divergence is only between the legal/architectural sense and the unrelated biological uses of the same word. Researchers encountering tegula in a legal source should read it as the architectural term without hesitation.
Why It Matters in Research
Tegula is a term of narrow technical significance, encountered almost exclusively in Roman law contexts and in scholarship or commentary derived from the Digest. Researchers will find it appearing in discussions of the sale of buildings and the question of what accessory materials pass with real property — a foundational issue in both Roman law and its civil law descendants.
The primary source reference across all three historical dictionaries is Digest 19.1.18, a passage from the title on the actio empti (the buyer's action arising from sale). That passage touches on what a seller must deliver when a building or property is sold, and whether items like tiles are included. Researchers working in the civil law tradition, particularly in topics involving fixtures, accession, or the transfer of building materials, should treat tegula as a pointer into this Digest passage and its surrounding context rather than as a standalone legal concept.
For Law Mind corpus researchers, the term is unlikely to appear in common law sources. Its presence in a document or treatise is a reliable signal that the author is engaging with Roman or civilian sources, and the surrounding text should be read with that interpretive frame in mind. Researchers tracing the civil law doctrines of fixtures or accession into modern civil law jurisdictions — Louisiana, Quebec, or mixed jurisdictions — may find the underlying concept operative even where the Latin term itself has dropped away.
Historical Dictionary Support
All three historical sources agree on the core definition: a tile, in the civil law. Black's (1st and 2nd editions) are nearly identical, each citing Digest 19.1.18 as authority. Burrill's entry is marginally more informative, noting the Latin root tegere (to cover) and placing tegula in the context of Roman material culture, though it immediately pivots to a separate entry for telonium/teloneum, suggesting the two terms appeared in proximity in the sources Burrill was working from.
None of the historical dictionaries develop the legal significance of the term beyond a bare identification and citation. This is a case where the historical sources function as index entries rather than substantive explanations — they flag the Digest location and move on. Researchers seeking the legal doctrine embedded in the term must go to the Digest passage itself and to civilian commentary on it.
Burrill's etymology note — from tegere, to cover — is accurate and occasionally useful for distinguishing cognate terms (tectum, a roof or covered structure, appears in related passages), but it does not alter the legal meaning.
Jurisdictional Note
Tegula as a legal term is confined to Roman law and sources derived from it. It has no independent doctrinal life in common law jurisdictions. In civil law jurisdictions, the underlying concept — what constitutes a fixture or building material that passes with a property sale — survives under different terminology.