Hypertext Webster Gateway: "copula"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From WordNet (r) 1.7 (wn)
copula
n : an equating verb (such as `be' or `become') that links the
subject with the complement of a sentence [syn: {copulative},
{linking verb}]
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