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(prō-trăk′təl, -tīl′, prə-) also


Capable of being protracted; extensible: protractile limbs and claws.

pro′trac·til′i·ty (prō′trăk-tĭl′ĭ-tē) n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Mouth large, superior: upper jaw protractile, with elaborate cartilages supporting premaxilla (Pietsch, 1984); lower jaw projecting, mandible with strong and sharp symphyseal process.
Characteristics of California Labridae: Mouth protractile; jaw teeth separate, projecting outward; dorsal fin with 8-14 spines and 9-13 soft rays; anal fin with 3 spines and 9-13 soft rays; caudal fin with 7+7 principal caudal rays; pectoral rays 12-19 soft rays; pelvic fins, 1 spine and 5 soft rays; 6 branchiostegal rays; gill rakers, 5-8 (upper limb) + 9-16 (lower limb) (note, gill raker counts for Semicossyphus pulcher are 6-7 + 10-11 = 17-19; R.
According to Blaber (2000), the highly protractile mouth is a characteristic of Gerreidae family that allows them to capture small invertebrates and explore available food resources in substrate.