... 5 The usual plural of penny is pence, e.g. fifty pence. Pennies are individual pennycoins.297 ... deer,some kinds offish, e.g. cod, salmon; and some nouns ending in s, e.g. headquarters,means. • 154 (3)NOTEa Some measurements (e.g. pound, foot) can be singular after a plural number, e.g. twopound/ ... medium mediacurriculum curriculaNOTE Some nouns in on and um are regular, e.g. electrons, museums. 5 es4 aeformula formulae / formulasstimulus stimuli cactus cacti /cactusesnucleus nuclei / nucleusesNOTE...