This Rule applies to those words in English with two or more syllables that end with the letters
....al
To translate them into Spanish, we will substitute the ending with
...al
(simple enough?)
English words ending in ....sial or ....tial that sound like "S" are
translated to Spanish by using the ending ....cial.
In Spanish, when "c" precedes an "i", it is pronounced like an "s"
(see Quirk # 8).
As an example, the English word partial is the Spanish word
parcial.
The English word Hortensial is the Spanish word Hortensial.
Otherwise, the spelling will be the same (observing the quirks).
English words ending in ...tial in which the "t" sounds like "
t" (as in bestial), are spelled the same in Spanish (bestial),
so here are a lot more Examples