User blog comment:The1AndOnlyMike/Friends, Romans, countrymen, lend me your ears/@comment-30553109-20180213212725/@comment-26440657-20180213223429

Disc as in disc-shaped is not the same as CD.

Plate slimes would be misleading since plate doesn't exclusively mean round and flat like the dishes, plates (the other meanings) can be other shapes or not flat at all. Saucer slimes would be more accurate.