deltoidal

[ del-toid-l ]
/ dɛlˈtɔɪd l /

adjective

of or relating to a river delta.

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. 2019