1. tomentum — de Vaan
tomentum 'flock, stuffing material' [n. o] (Varro+) Pit. *towamnl PIE *teuh2-mn [n.] 'swelling'? *touh2-eie- [prxaus.]? IE cognates: see s.v. tueor. WH and IEW assume tomentum < *towementom to the root *teuhr 'to swell, increase' (a caus.pr. *toilH-eie- 'to stufF?). A preform *teuhrmn would yield Pit, *towamn > *towamen > *tomen. A preform *towamentom would yield *Wmentumy but *towa/i- could have been restored on … — [de Vaan, s.v. tomentum, p. 636]