Definition of deltoid in English:

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Pronunciation: /ˈdeltoid/


1Triangular: a tree with large deltoid leaves
More example sentences
  • In some cases, the deltoid branch of the profunda brachii (16% of individuals) arises from the brachial or from the superior ulnar collateral.
  • Farther distally around the middle part of the shaft, is the deltoid tuberosity along the lateral border.
  • Specimens are members of the Hyperoblastidae based on presence of four spiracles and anispiracle, deltoid crests (not faces), and two to four anideltoids.
1.1Denoting a thick triangular muscle covering the shoulder joint and used for raising the arm away from the body.


1A deltoid muscle.
Example sentences
  • Feel the three distinct heads of each deltoid contract and relax.
  • This is why each deltoid is made up of three heads, each of which has a separate function.
  • The cable crossover works the pectoralis major and minor, anterior deltoid, coracobrachialis and serratus anterior.
1.1Each of the three parts of a deltoid muscle, attached at the front, side, and rear of the shoulder: the anterior deltoid
More example sentences
  • One key to shoulder training is to think of your front, side and rear deltoids as distinct (but small) muscles.
  • The rear deltoid, teres minor and infraspinatus are responsible.
  • The heavier you can go with your bench-press sets, the better for your pectorals, anterior deltoids and triceps, provided their work is not being stolen by cheating.


Mid 18th century: from French deltoïde, or via modern Latin from Greek deltoeidēs.

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Syllabification: del·toid

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