impactedadj.

1683 W. Salmon Doron Medicum ii. 463 To melt (as it were) any impacted humor, though never so tough.

1721 W. Gibson Farriers Dispensatory i. i. 25 To ripen or dissolve hard impacted Humours.

1856 E. K. Kane Arctic Explor. I. xxi. 267 The fine impacted snow-dust of winter.

1844 Boston Med. & Surg. Jrnl. 30 309 (heading) History of a case of impacted colon.

1850 Lancet 19 Jan. 80/2 The bowel is found in a state of great distention from an impacted mass closely adhering to its walls.

1875 Cincinnati Med. News VIII. 353 (heading) Remarkable case of impacted colon, with suppression of urine.

1902 J. P. Tuttle Treat. Dis. Anus (1903) xiv. 545 Distressing symptoms are relieved either by the loosening up of an impacted fæcal mass, or possibly by the undoing of a volvulus or intussusception.

1972 F. A. Jones in Jones & Godding Managem. Constipation iv. 128 In some patients, impaction may have already led to severe symptoms, with acute distress, and it is then necessary to organize the immediate removal of the impacted faeces.

1850 J. A. Orr Princ. Surg. ii. xi. 153 Impacted fracture is when one broken extremity of the bone is driven into and lodged in the other.

1886 A. H. Buck Ref. Handbk. Med. Sci. III. 234/2 Multiple, comminuted, and impacted fractures.

1921 F. H. Baetjer & C. A. Waters Injuries & Dis. Bones & Joints v. 102 When the fracture is just behind the head [of the femur] or in the middle of the neck, impaction is relatively rare. Fracture at the base is generally impacted.

1929 Encycl. Brit. IX. 577/1 An impacted fracture is one in which the broken ends are driven together by the causative violence in such a way as to become locked.

1967 E. L. Ralston et al. Handbk. Fractures vii. 116 Impacted fractures [of the humeral neck] even with angulation of 25 to 30 degrees are best treated with the use of a sling and swathe and early active exercises.

1876 T. Bryant Pract. Surg. (ed. 2) I. xiii. 546 In all cases where the impaction of a lower wisdom tooth is a source of irritation, the impaction should be at once got rid of... The serious results which may attend purulent inflammation about an impacted wisdom tooth, will receive notice later.

1928 H. Prinz Dis. Soft Struct. Teeth i. 29 Impacted teeth usually do not cause painful symptoms unless they meet on their path of retarded eruption an obstruction or they exert pressure upon nerve fibers.

1971 E. R. Costich & R. P. White Fund. Oral Surg. viii. 93/2 The maxillary third molars frequently fail to erupt but may not necessarily be regarded as impacted teeth.

1952 A.M.A. Arch. Industr. Hygiene & Occup. Med. V. 464 Although the size of impacted particles can be measured under a microscope, the impaction principle..is used more as a method of sampling than as a method of determining the particle-size distribution.

1924 in Sci. Amer. (1974) July 12/1 One need only study a large raindrop falling into a still pool of water. There is first a surging outward of the impacted water.

1963 Economist 25 May 777/2 The..scheme for aid to ‘impacted’ areas (where schools are over-loaded).

1967 Compton Yearbk. 232/1 Funds were also earmarked for..federally ‘impacted’ areas, that is, areas where the families of federal workers had swollen school enrollments.

1970 Time 6 Apr. 12 Nixon..proposed that $1.5 billion in federal funds be made available to ‘racially impacted areas’..to help desegregating school districts meet their special needs.

1971 Nature 16 July 162/2 The shape of a newly formed impact crater is caused by the sudden release of the kinetic energy of the impacting mass within a small volume somewhat below the original impacted surface.