出典:Wiktionary
出典:『Wiktionary』 (2025/08/10 21:53 UTC 版)
Borrowed from Proto-Brythonic *trum, or perhaps from theorized Proto-West Germanic *trum, from Proto-Germanic *trumaz, meaning "root". See Breeze 1993.
trum
出典:『Wiktionary』 (2026/08/02 20:58 UTC 版)
In inherited words, from Proto-Italic *-trom, from Proto-Indo-European *-trom. In words borrowed from Greek (and possibly in some neologisms), from Ancient Greek -τρον (-tron, instrument noun suffix), a cognate of the Latin ending. Compare -culum, -crum, -bulum, -brum; these and -trum seem to have originated as contextual variants of a single suffix.
-trum n (genitive -trī); second declension
While Latin was a living language, this instrument noun suffix was less productive than -culum (from *-tlom, a variant form of the same suffix). Weiss 2009, citing Serbat 1975, describes -trum as moribund and unproductive after the time of Augustus; Owens 2016, citing Mir 1984, likewise characterizes -trum as unproductive and "archaic even in the classical period". In native Latin words, -trum generally can be found only in two circumstances:
Words that show -trum after earlier /r/ or /l/ might be remnants of an old formation pattern: arātrum seems to be inherited from Proto-Indo-European *h₂érh₃trom (albeit with analogical replacement of *-a- with -ā-). Instrument nouns in (...)r...culum and (...)l...crum would then represent a more recent pattern. Sen 2015 assumes deverbal nouns ending in -trum, such as fulgetrum, were formed earlier than the two denominative nouns tālitrum and *calcitrum (the hypothetical base of the verb calcitrō), arguing that in the latter words, the vowel before -trum was reduced to -i- because of a syllable boundary caused by a transparent morpheme boundary in archaic Latin.
The corresponding Ancient Greek ending -τρον (-tron) enjoyed a wider use, and some Greek words with this ending were adapted in ancient times as Latin words ending in -trum, such as scēptrum (from Greek σκῆπτρον (skêptron)) and metrum (from Greek μέτρον (métron)).
In addition, -trum has occasionally been used to derive neologisms from Latin roots outside of the two conditions described above.
The suffix is typically neuter, but a feminine by-form -tra can be seen in the instrument noun mulctra (also mulctrum), possibly also in mollestra (but it is dubious whether this word contains this suffix). A masculine by-form -ter can be seen in the instrument noun culter (“knife”) and in arāter, a rare variant form of arātrum (“plough”).
Second-declension noun (neuter).
| singular | plural | |
|---|---|---|
| nominative | -trum | -tra |
| genitive | -trī | -trōrum |
| dative | -trō | -trīs |
| accusative | -trum | -tra |
| ablative | -trō | -trīs |
| vocative | -trum | -tra |