A variant or alternative term for blastula, sometimes used in older biological texts.
From German 'Blastule,' a variant spelling/form of 'Blastula.' Appears in some European and older English biological literature but is largely superseded by 'blastula.'
Scientific terminology evolves, and 'blastule' is a casualty—once scientists settled on 'blastula' as the standard term, the variant spelling faded away. It's like how 'aeroplane' lost to 'airplane.'
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