
1) Architectural groove 2) Gutter 3) Trough
Found on
https://www.crosswordclues.com/clue/cullis

• (n.) A strong broth of meat, strained and made clear for invalids; also, a savory jelly. • (n.) A gutter in a roof; a channel or groove.
Found on
http://thinkexist.com/dictionary/meaning/cullis/
Cul'lis (k...l'l...s)
noun [ Old French
coleïs , French
coulis , from Old French & French
couler to strain, to flow, from Latin
colare to filter, strain; confer Late Latin
coladicium . Confer
Colander .] A strong broth of meat, strained and made clear for inv...
Found on
http://www.encyclo.co.uk/webster/C/200
Cul'lis noun ;
plural Cullises (-...z). [ French
coulisse groove, from the same source as English
cullis broth.]
(Architecture) A gutter in a roof; a channel or groove.
Found on
http://www.encyclo.co.uk/webster/C/200

Cullis is a very fine and strong broth, well strained, formerly much used for invalids.
Found on
http://www.probertencyclopaedia.com/browse/QC.HTM

A cullis (also killesse or coulisse) is a gutter in a roof; a channel or groove.
Found on
http://www.probertencyclopaedia.com/browse/TC.HTM

[
n] - a gutter in a roof
Found on
http://www.webdictionary.co.uk/definition.php?query=cullis
noun a gutter in a roof
Found on
https://www.encyclo.co.uk/local/20974

a gutter, as at the eaves of a roof.
Found on
https://www.infoplease.com/dictionary/cullis
No exact match found.