Lewis & Short

dis-plōdo, no perf., ōsum, 3, v. a., to spread out, dilate, extend (for the most part only ante- and post-class., and in the part. perf.; in class. prose not at all): pedibus magnis, et altis, qui ingredienti ei displodantur, Varr. R. R. 2, 9, 4; id. ib. 2, 5, 8.
In the part. perf., burst asunder: vesicula displosa repente, Lucr. 6, 131; cf. * Hor. S. 1, 8, 46: repente templa caeli, Lucr. 6, 285 (for which: divolsa repente, ib. 122): nares, spread out, broad, Arn. 3, p. 108; 6, p. 196.