Kommentar zu Jechezkiel 44:20

And [the hair of] their heads they are not to shave to remove all the hair.

but also not to let it grow wild They may not let their hair grow very long.

they must be careful to trim [Heb. כָּסוּם יִכְסְמוּ, (to cut the hair so that it appears)] like spelt (כֻּסֶמֶת), which is arranged on the ear [with] the end of one beside the root of another. So I heard in the name of Rabbi Menahem of blessed memory. It is possible to explain it as an expression for a measure of a medium thing, neither shearing [all the hair of] the head nor letting the hair grow long, but a medium amount, amo(d)ler in O.F., to cut to medium length.