Etymology
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decker (adj.)

in combinations, "having a (specified) number of decks," originally of vessels, 1795, from deck (n.). Later of stacked sandwiches.

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Definitions of decker
1
decker (n.)
(often used in combinations) something constructed with multiple levels;
they rode in a double-decker bus
2
Decker (n.)
English dramatist and pamphleteer (1572-1632);
Synonyms: Dekker / Thomas Dekker / Thomas Decker
From wordnet.princeton.edu