Of the six Moon Breathing forms in this dictionary, Eighth Form is the cleanest citation: the corpus's stored Japanese and English for Volume 20 page 53 match the real printed VIZ page one-to-one, panel for panel, with no OCR garbling and no cross-page bleed — a rarity in this stretch of the corpus, where the English edition otherwise runs a page ahead of the Japanese for most of Kokushibo's numbered-form sequence. That alignment makes it easy to see VIZ's translation choice clearly: "MOON-DRAGON RINGTAIL" keeps both halves of the compound (月龍, "moon-dragon"; 輪尾, "ring-tail") as a single hyphenated noun phrase, matching the treatment given to Seventh Form's two-clause "Mirror of Misfortune, Moonlit" only loosely — Moon Breathing's naming register isn't perfectly uniform even within a single fight.
龍 (dragon) is a comparatively rare image in Moon Breathing's technique names, most of which lean on lunar phases, mirrors, and weather (moonbow, waning moon, moon through leaves). A coiled dragon is borrowed imagery — dragons appear constantly in Japanese sword-fighting terminology and Buddhist temple ceiling paintings as symbols of protection and cyclical power, and 輪 (ring/wheel) carries a faint echo of 輪廻 (rinne, the Buddhist wheel of reincarnation/samsara), though that's likely a case of the vocabulary's connotations doing quiet work rather than an intentional doctrinal reference. What's more concretely legible is the geometry: a "ring-tail" strike is a blade that returns to where it started, useful against an opponent circling for an opening, which is exactly what Sanemi and Genya are doing to Kokushibo across these pages.
Eighth Form also marks the point in the fight where Kokushibo starts chaining numbered forms in rapid, unbroken succession — Seventh into Eighth into Ninth into Tenth within the space of about six manga pages. That density of naming, seven centuries' worth of a single family's swordsmanship distilled into consecutive splash-panel reveals, is part of what makes Moon Breathing read differently from every other style in the series: no other swordsman fires off this many named forms this fast, because no other swordsman has spent four hundred years refining a solo repertoire with nobody left alive to watch.