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deltoidal

[del-toid-l]
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adjective
  1. of or relating to a river delta.
  2. deltoid(def 3).
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Origin of deltoidal

First recorded in 1830–40; deltoid + -al1
Related formssub·del·toi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018