primus(redirected from primuses)
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pri·mus(prī'mŭs), This form of the adjective is used only with masculine nouns (digitus primus, plural digiti primi). With feminine nouns the form prima is used (phalanx prima, plural phalanges primae), and with neuter nouns the form primum (septum primum, plural septa prima).
First; denoting the first of a series of similar structures.