See:
Melbay's Fiddling Chord Book, written by Craig Duncan
Page 1 explains (to me) it is a matter of two notes, not if one or both are open strings. Initially it explains a chord is three notes, but for the sake of fiddling it will be two notes.
If one has dabbled in piano, one will find there are three ways to arrange a chord. Known as inversions. A fiddle chord defined as two of three notes, what constitutes as a chord is multiplied. I love chord theory.

Although double stop sounds like it requires strings to be stopped against the fingerboard by the fingers, it applies equally to the open strings. A double stop is simply two notes played simultaneously, one on each of two strings.

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Originally posted by The Violin Beautiful

Although double stop sounds like it requires strings to be stopped against the fingerboard by the fingers, it applies equally to the open strings. A double stop is simply two notes played simultaneously, one on each of two strings.

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I'll remember that as I used Double Stop even if a string was open but heard some where that it's not correct.  I will now assume it's correct ...  it's folk music after all. 

I know about stopping two strings, I know about playing one string stopped and another open, and I know about playing two strings open.

I’m not very smart, and unfortunately I’m getting stupider as I get older. So I gotta try to keep things simple. So I think of them all “double stops”.

I know it ain’t exacly right, but it works fine for me. The name is unimportant, but it is important to use all of the resources of our little fiddles to speak the music.

"Interval"

I play on two strings a lot. However, my main playing is at the melody and the phrasing. So when playing on two strings, I try and keep the harmony string quieter than the melody string (whether either is an open string or a fingered string).

If you want to nitpick, you could argue that the open string is in fact a stopped string as well, because the nut and bridge establish the vibrating string length for the pitch at given tensions. When you put a finger down, it’s analogous to moving the nut to a different spot along the fingerboard without changing anything else.

There are whole etudes and etude books devoted to double stop exercises, and the open string double stop is a part.

Yep.. There are strong consistent drones, Two finger drones, one finger drones, incidental drones, pulsed drones, light drones, yada yada.. There is a lot to it..

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Originally posted by learn2turn

The term "double-stop" is nice and terse but it covers fingering both notes. I'm a novice but I don't think players use the double-stop term when one (or both) notes are open.

There is "drone string" but then you need a different determine depending on whether you are fingering both or not. Further, I think of drone string when one note stays the same with a sequence of notes are fingered on the another string.

If there a term for bowing two notes regardless of the whether one or both notes are fingered or open?

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Dyad. -
is a term which refers to playing 2 notes at once. Some folks might call it chording, but chord generally is based a major/minor triad (and extensions).

As far as the term "stop", your description follows what I've seen and the etymology in reference to what a "Stop" is.

https://en.wikipedia.org/wiki/Stopped_note (sources listed)

"On string instruments, a stopped note is a note whose pitch has been altered from the pitch of the open string by the player's left hand pressing (stopping) the string against the fingerboard."

Thus a double stop would mean 2 fingered notes.

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Originally posted by alaskafiddler

quote:

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Originally posted by learn2turn

The term "double-stop" is nice and terse but it covers fingering both notes. I'm a novice but I don't think players use the double-stop term when one (or both) notes are open.

There is "drone string" but then you need a different determine depending on whether you are fingering both or not. Further, I think of drone string when one note stays the same with a sequence of notes are fingered on the another string.

If there a term for bowing two notes regardless of the whether one or both notes are fingered or open?

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Dyad. -
is a term which refers to playing 2 notes at once. Some folks might call it chording, but chord generally is based a major/minor triad (and extensions).

 

As far as the term "stop", your description follows what I've seen and the etymology in reference to what a "Stop" is.

https://en.wikipedia.org/wiki/Stopped_note (sources listed)

"On string instruments, a stopped note is a note whose pitch has been altered from the pitch of the open string by the player's left hand pressing (stopping) the string against the fingerboard."

Thus a double stop would mean 2 fingered notes.

 

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No, that's a hallucination. Double stops can be open strings. Again, if you have any familiarity with double stop exercises this is obvious. But since you prefer Wikipedia as a source of information, that will also tell you that double stops can be played on open strings:

https://en.wikipedia.org/wiki/Double_stop