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- n. Plural form of implosive.
Sorry, no etymologies found.
Now, while Glottalic Theory explains that PIE's purported ejectives had mostly eroded into implosives or "preglottalized" phonemes in almost all dialects without explaining why exactly voiced *d was the overwhelmingly typical end result, my Hybrid Theory position has been that these stops were already voiced in PIE.
At least one IE language, Sindhi, has implosives fwiw.
His reinterpretation of Winter's Law was that the implosives somehow developed a glottal stop segment preceding a plain voiced stop.
1 Kortlandt, Baltica & Balto-Slavica (2009), p.68 (see link): "In my view, the original PIE ejectives developed into implosives in all branches except Anatolian and Tocharian, and show traces of glottalization and/or partial merger with the laryngeals in Germanic, Italic, Greek, Armenian, Indo-Iranian, and Balto-Slavic."