Plural of frustule; the siliceous cell walls of multiple diatoms or collections thereof.
Standard English plural of 'frustule,' formed by adding -s. While 'frustula' is the Latin plural, English-speaking scientists typically use 'frustules.'
Scientists often use English plurals (frustules) instead of Latin ones (frustula), which shows how English has taken over as the language of science—Latin rules are fading even in technical fields!
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