This is the 4309th most frequent Polish word.
elektryczną
"Electric" (feminine form in Polish).
Here, 'elektryczną' is used as an adjective in its feminine accusative form to describe a bicycle.
Mam rower elektryczną z napędem hybrydowym.
I have an electric bicycle with a hybrid drive.
In this sentence, 'elektryczną' describes the toothbrush as electric, again in the feminine accusative form.
Używa ona szczotkę elektryczną do zębów.
She uses an electric toothbrush for her teeth.
'Elektryczną' here is an adjective in the feminine accusative case modifying the noun 'kuchenka' (stove).