(plural preoperculums or preopercula)
pre- + operculum
"preoperculum." YourDictionary, n.d. Web. 01 March 2019. <https://www.yourdictionary.com/preoperculum>.
preoperculum. (n.d.). Retrieved March 01st, 2019, from https://www.yourdictionary.com/preoperculum
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