Century Dictionary and Cyclopedia
- Lying outside of or external to the branchial arches; forming the external support of the branchial septa.
- n. A term applied by W. K. Parker to certain cartilages which take part in the formation of supports for the divisions between the gill-chambers in tadpoles, lampreys, and sharks. In lampreys the extrabranchials are the vertical bars of the branchial basket; in sharks they are the cartilaginous bands external to the rays of the branchial septa.
GNU Webster's 1913
- adj. (Anat.) Outside of the branchial arches; -- said of the cartilages thus placed in some fishes.
- extra- + branchial (Wiktionary)
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