regmaglypt
A small, shallow indentation or pit on the surface of a meteorite, resembling a thumbprint impression in clay, created by ablation while falling in an atmosphere.
But, as the author has established, when an individual sample of a meteorite shower has a semi-orientated shape (roughly conoid, as in the given case), it must have definite morphological properties: on its front surface it must have a fully developed typical regmaglypt – relief which has had time to form during the sample's movement at cosmic speed after its separation from the main meteoric body.
Where it comes from
From Ancient Greek ῥῆγμα (rhêgma, “something broken or rent asunder; a breach, cleft, fracture”), + γλυπτόν (gluptón, “carving, sculpture”).
Adapted from the Wiktionary entry regmaglypt (CC BY-SA 4.0).