A word for “looking-glass” in notes written in the late 1950s or early 1960s, the equivalent of but not a direct cognate to S. cenedril (PE17/37). Its initial element was Q. cilin “glass” and its final element was based on an ancient adjective ✶tirlā “looking” from √TIR “look at”.
Neo-Quenya: In notes written in the late 1960s Tolkien gave calca for “glass”, possibly rendering cilintilla obsolete. I feel that cilin and calca can coexist as words for different kinds of glass and so I retain cilintilla as “looking-glass, ✱mirror”, but if you are concerned about it you can use Q. angal for “mirror”, another word from the late 1960s.
A noun for “mirror” in notes from the late 1960s, derived from primitive ✶aññala based on the root √ñal- (NM/350, 353). Another derivative of this root was ✶ñalatā “a glitter (of reflected light)” (NM/349), so perhaps this word meant “mirror” in the sense “✱reflective surface”.