Talk:-idus

Usage notes

The entry says that -idus “forms adjectives from verb stems”, which may be true in such cases as acidus (from aceō), horridus (from horreō), liquidus (from liqueō), tepidus (from tepeō), and torridus (from torreō), but what shall we say about the likes of limpidus (from līmō?), and trepidus (from tremō? surely not from trepidō; there, derivation seems far more likely to have worked in the other direction). --Grosbach (talk) 07:19, 1 January 2013 (UTC)

It's more complicated; the suffix is part of the Latin expression of the Caland system, and the derivation does not start from any synchronic Latin form originally, but from a verbal root. You will find many tetrads like liquēre/liquēscere/liquor/liquidus in Latin where it is not obvious what the starting point is.

And the suffix -idus is not a descendant of the Greek suffix; if anything, it's cognate, but I'm not really sure about that. --Florian Blaschke (talk) 18:10, 6 June 2014 (UTC)