To find language dictionaries, both print and digital, search the library catalogue (Omni) by subject: "Spanish language" AND dictionaries.
Dictionaries are either abridged (most commonly used words - generally one volume) or unabridged (virtually complete and multi-volume).
Dictionaries are either prescriptive (dictating, with authority, the correct usage) or descriptive (neutrally noting language trends).
There are many different types of dictionaries: etymological (language history), colloquial (slang), regional, visual, dialect, bilingual, unilingual, of expressions, of swear words, etc.
Every discipline of study has specialized dictionaries of the vocabulary used in that field.