Definition from Wiktionary, a free dictionary

Informal abbreviation of dictionnaire.

dico m. (plural dicos)

1. (informal) dictionnaire

   J'adore c'dico! i.e. J'adore ce dictionnaire (I love this dictionary).

dico

1. first person singular present tense of dire

• IPA: /ˈdiː.koː/

present active dīcō, present infinitive dīcere, perfect active dīxī, supine dictum.

1. I say, speak, talk.

   Dixit duas res ei rubori fuisse.

   He said that two things had abashed him.

2. I affirm, declare, state.
3. I tell, call.
   • c. 254–184 BCE, Plautus, Captivi ("The Captives"), 623, (English and Latin text)

     Eho dic mihi, quis illic igitur est?

     Hey? Tell me, who is he then?

• IPA: /ˈdi.koː/

present active dicō, present infinitive dicāre, perfect active dicāvī, supine dicātum.

1. I dedicate, devote.
2. I consecrate, set apart.