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English word cinder block comes from English cinder, English block
cinder (English)
(transitive) to reduce something to cinders An ember.. Partially or mostly burnt material that results from incomplete combustion of coal or wood etc.. Slag from a metal furnace.
block (English)
(computing, intransitive) To wait.. (intransitive, cricket) To play a block shot.. (transitive) To disable communication via telephone, instant messaging, etc., with an undesirable someone.. (transitive) To fill (something) so that it is not possible to pass.. (transitive) To prevent (something from happening or someone from doing something).. (transitive) To prevent (something or someone) [...]
cinder block (English)
A lightweight building block made from cinders and concrete.