bipennate

From bi- +‎ pennate.

bipennate (not comparable)

1. (medicine, anatomy, zoology) Of, pertaining to, or having the nature of a muscle, the fibres of which attach to a tendon on two sides (as a feather barbed on both sides).
   • 1999, Christopher McGowan, A Practical Guide to Vertebrate Mechanics:

     It then follows that bipennate muscles generate even more force than unipennate ones of similar volume, and the force increases with the angle of pennation.

   • 2007, Neal S. Elattrache, Christopher D. Harner, Raffy Mirzayan, Jon K. Sekiya, editors, Surgical Techniques in Sports Medicine, page 50:

     Beneath the deltoid lies the external rotators of the shoulders, including the bipennate infraspinatus and the teres minor (Fig. 5-20B).

   • 2008, John O'Neill, Musculoskeletal Ultrasound: Anatomy and Technique, page 4:

     Bipennate muscles have a central tendon with oblique insertion fibers on both sides, eg, the rectus femoris (Figure 1.3c).

2. (botany, of leaves) Bipinnate (pinnate and having a pinnate leaflet).
   • 1849, Adrien de Jussieu, James Hewetson Wilson, The Elements of Botany, page 501:

     Its bipennate leaves are composed of a slightly straightened general petiole, of four partial petioles, situated, two at the extremity of the proceeding, and convergent, two a little lower, and growing almost at right angles; each of them bearing more than twenty pairs of small horizontal petioles.

   • 1897, William Thomas Fernie, Herbal Simples Approved for Modern Uses of Cure, 2006 Gutenberg eBook edition:

     But this Burnet Pimpinella is of a different (Umbelliferous) order, though similarly styled because its leaves are likewise bipennate.

3. Having two wings; bipennated.

• multipennate
• unipennate

• Bipennate muscle on Wikipedia.Wikipedia

bipennate

1. feminine plural of bipennato