triradiusn.
/trʌɪˈreɪdɪəs/ In dermatoglyphics, a point from which the dermal ridges radiate in three directions at angles of approx. 120 degrees.
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triradius1960
1960 New Scientist 14 July 129 (caption) A finger-print on which a white line has been drawn joining the core of the pattern..to the associated triradius.
1965 New Scientist 11 Feb. 345/2 There are discontinuities [in the fingerprint pattern], known technically as ‘triradius points’, where three ridges meet at a single junction.
1970 P. Laurie Scotl. Yard ix. 193 There are two basic finger-print patterns: loops, where the lines turn through two right angles, and triradii.
1971 J. Z. Young Introd. Study Man xxxix. 570 For genetic analysis counts are made from the triradius to the centre of the pattern.
1977 Sci. Amer. Dec. 141/1 The resulting patterns are known to the dermatologist respectively as loops, triradii and whorls.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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n.1960