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deltoid muscle

deltoid muscle

4.2
A large triangular shoulder muscle that lifts and turns the arm
  • noun
  • /ˈdɛl.tɔɪd ˈmʌs.əl/
  • Specialized
translation icon : músculo deltoides
  • During the workout, I felt the strain in my deltoid muscle as I pushed the weights overhead.

Examples

  • The deltoid muscle helps lift the arm during exercises like shoulder presses.

  • Patients were re-examined before surgery to ensure no return of deltoid muscle contraction on attempts at shoulder forward flexion and abduction.

    Academic text (2015)
  • To begin this exercise for the anterior deltoid muscle, start in a seated or standing position.

    Academic text (2002)
  • The two anatomical sites recommended as routine injection sites are the anterolateral thigh and the deltoid muscle.

    Academic text (2015)
  • It should be administered via intramuscular injection, preferably into the deltoid muscle, and can be given at the same time as other recommended vaccines.

    Academic text (2011)
  • Figure 3: With loss of the left deltoid muscle, the humerus sags within the glenoid fossa, causing a lack of stability.

    Academic text (2015)
  • The physical therapist explained how the deltoid muscle plays a crucial role in arm rotation.

Synonyms

deltoid
vsdeltoid muscle
  • Specialized
6 4.6

A large triangular muscle on the shoulder that lifts and turns the arm

is the same term but written in a slightly different phrasing
delt
vsdeltoid muscle
  • Slang
3 9.1

The muscle on the top of your shoulder

is the standard anatomical name used in neutral and formal contexts
musculus deltoideus
vsdeltoid muscle
  • Specialized
6.2

A large triangular muscle on the shoulder that lifts and moves the arm

focuses more narrowly on lifting and rotating the arm
deltoideus
vsdeltoid muscle
  • Specialized
7.5

A shoulder muscle that lifts the arm away from the body

covers broader movements including rotation as well as lifting

Surface Forms

Morphology

deltoid + muscle

The phrase is fully compositional: 'deltoid' names a specific triangular shoulder muscle and 'muscle' classifies it, so the combined meaning (the shoulder muscle called the deltoid) is directly derivable from the parts. Anatomical noun‑noun naming is common across languages, so a B1 learner who knows both constituents will readily understand this MWE.

Etymology

Deltoid muscle comes from the Greek letter delta, which is a 'triangle', because the muscle sits on the shoulder in a triangle shape. So the name points to its current meaning as the large triangular muscle that lifts and turns the arm.