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[vas-tuh s]
noun, plural vas·ti [vas-tahy] /ˈvæs taɪ/. Anatomy.
  1. any of several muscles in the front part of the thigh constituting part of the quadriceps muscle, the action of which assists in extending the leg.
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Origin of vastus

< Latin: vast
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for vastus

Historical Examples

  • In the dog and the cat the vastus externus is the most voluminous of the three portions which constitute the triceps muscle.

    Artistic Anatomy of Animals

    douard Cuyer

  • It covers the rectus and vastus externus portions of the triceps cruris; it is also in relation with the gluteal muscles.

  • The two fasciculi then pass towards the knee, being in relation with the rectus and the vastus internus of the triceps.

  • We also partly see there, in these animals, the vastus internus and the rectus of the triceps (see Fig. 87).

  • Vastus animus immoderata, incredibilia, nimis alta semper cupiebat.

    De Bello Catilinario et Jugurthino

    Caius Sallustii Crispi (Sallustius)