tremulus

Latin edit

From tremō (“tremble”) +‎ -ulus (“-ing”).

tremulus (feminine tremula, neuter tremulum); first/second-declension adjective

Case / Gender	Masculine	Feminine	Neuter	Masculine	Feminine	Neuter
Number	Singular			Plural
Nominative	tremulus	tremula	tremulum	tremulī	tremulae	tremula
Genitive	tremulī	tremulae	tremulī	tremulōrum	tremulārum	tremulōrum
Dative	tremulō	tremulae	tremulō	tremulīs
Accusative	tremulum	tremulam	tremulum	tremulōs	tremulās	tremula
Ablative	tremulō	tremulā	tremulō	tremulīs
Vocative	tremule	tremula	tremulum	tremulī	tremulae	tremula

With the original sense of 'trembling':
- Galician: tremo
- Italian: tremolo
- Old Occitan: tremol
- Sardinian: tremulu
With the sense of 'electric ray':
- Galician: tremo
- Italian: tremola ⇒ tremella
- Middle French: tremble, tromble
- Occitan: tremolina
With the sense of 'tremor, minor earthquake':
- Galician: tremo
- Spanish: tiemblo
With the sense of 'quaking bog':
- Galician: tremo, trema, trémbora
With the sense of 'clover':
- ⇒ Old French: tranline, trambline
- ⇒ Picard: tramène
- ⇒ Walloon: trimbleune
Learned borrowings:
- → Catalan: trèmul
- → English: tremulous
- → Galician: trémulo
- → Italian: tremulo
- → Portuguese: trémulo, trêmulo
- → Spanish: trémulo

Substantivization of etymology 1. Attested in the sixth century in the works of Plinius Valerius.

tremulus m (genitive tremulī); second declension (Late Latin)

Italo-Romance:
- Italian: tremula
North Italian:
- Ladin: tremolo
- Piedmontese: tremmu, termu
- Romansch: triembal, trembel
Gallo-Romance:
- Catalan: trèmol
- Franco-Provençal: trembllo
- French: tremble
- Occitan: tremol, tremola, tremble
Ibero-Romance:
- Spanish: tiemblo

Walther von Wartburg (1928–2002) “trĕmŭlus”, in Französisches Etymologisches Wörterbuch (in German), volumes 13: To–Tyrus, page 245