trigeminal

-al

Of or pertaining to. Adjectival suffix appended to various words, often nouns, to produce an adjective form. Often added to words of Latin origin, but used with other words also. · Forming nouns, especially of verbal action.

也可拆解为

tri-

Three. · (chemistry) Used for the digit three to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.