The word תּוֹתָח (totákh) appears in Job 41:29, apparently in reference to a shooter of stones. When the cannon was invented, the word was applied to it.
תּוֹתָח • (totákh) m (plural indefinite תּוֹתָחִים, singular construct תּוֹתַח־, plural construct תּוֹתְחֵי־)