alumnus, alumni
nursing, pupil
cactus, cacti
cactus, prickly plant
focus, foci
center, focus, (“hearth”)
fungus, fungi
mushroom, fungus
locus, loci
place
musculus, musculi
muscle
nasus, nasi
nose
nervous, nervi
nerve
radius, radi
spoke (of wheel) ray
stimulus, stimuli
goad, incentive
terminus, termini
end, end point
addendum, addendi
a thing to be added
cavum, cavi
hollow space, cavity
curriculum, curriculi
course of study (running, race)
datum, dati
item of information (“thing given”)
exemplum, exempli
example
medium, meddi
transmitter (middle thing)