Kernel

зерно́

zernó

(single seed of corn or wheat)

зёрнышко

zjórnyško

(single seed of corn or wheat)

ко́сточка

kóstočka

((US) stone of certain fruits, such as peaches or plums)

сердцеви́на

serdcevína

(central part of a nut)

су́щность

súščnostʹ

(core or essence of an object or system)

суть

sutʹ

(core or essence of an object or system)

ядро́

jadró

(central part of a nut)

ядро́

jadró

((computing) central part of many computer operating systems)

ядро́

jadró

((mathematics, algebra) set of elements mapped to zero)