1. the triangular muscles that cover the shoulder joints and lift the arms
Usage: anatomy; plural of deltoid

Examples

• The swimmer’s deltoids were well-developed from years of training.
• Push-ups help strengthen your deltoids and other upper body muscles.
• She felt soreness in her deltoids after the weightlifting session.
• The physical therapist examined his deltoids for signs of injury.
• Strong deltoids are important for overhead lifting movements.
• The bodybuilder focused on exercises that would build his deltoids.