Copula \Cop"u*la\, n. [L., bond, band. See Couple.]
1. (Logic & Gram.) The word which unites the subject and
predicate.
2. (Mus.) The stop which connects the manuals, or the manuals
with the pedals; -- called also coupler.
Source: Webster's Revised Unabridged Dictionary (1913)
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Coupler \Coup"ler\ (k?p"l?r), n.
One who couples; that which couples, as a link, ring, or
shackle, to connect cars.
Coupler of an organ, a contrivance by which any two or more
of the ranks of keys, or keys and pedals, are connected so
as to act together when the organ is played.
Source: Webster's Revised Unabridged Dictionary (1913)
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