Reconstruction:Proto-Celtic/-tus

This Proto-Celtic entry contains reconstructed terms and roots. As such, the term(s) in this entry are not directly attested, but are hypothesized to have existed based on comparative evidence.

Proto-Celtic

Etymology

From Proto-Indo-European *-tus.

Suffix

*-tus m

1. Forms action nouns from verb stems.

Inflection

Masculine/feminine u-stem
	singular	dual	plural
nominative	*-tus	*-tū	*-towes
vocative	*-tu	*-tū	*-tūs
accusative	*-tum	*-tū	*-tums
genitive	*-tous	*-tous	*-towom
dative	*-tou	*-tubom	*-tubos
locative	*?	*?	*?
instrumental	*-tū	*-tubim	*-tubis

Derived terms

Proto-Celtic terms suffixed with *-tus

Descendants

• Proto-Brythonic: *-d
  • Welsh: -d
• Old Irish: -ad, -ed (slender form); -ud (often with A II verbs)
  • Irish: -adh
  • Manx: -ey
  • Scottish Gaelic: -adh
• Gaulish: -tus