The PIE form of these words can't include *dzt
because Latin shows *t>0 / C d _ l, leaving the other
as d, not *dz.
The clusters with Cdtl were simplified to Cdl so:
*rèxd+ > ra:do: 'scrape'
*rèxdtló+s rx,dtl(e)+ > ra:dula
*pènd+ > pendo: 'hang'
*pèndtló+s pn,dtl(e)+ > pendulum
Similar loss of *t before devoicing, etc., in
certain clusters can be seen in other IE languages,
not just by d:
*vèrgYhtló+s vr,gYhtl(e)+ 'strangling tool = hangman's
rope' > ON virgill
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