The OED, for me, will always be, in its first edition, my preferred monolingual English dictionary. Though, the work of many people, it was more than half edited by James Murray. The Merriam-Webster's Collegiate still has a place in my heart since it was the first dictionary I owned; I got it on my 8th birthday. Lewis and Short for Latin, even though the Oxford is more up to date. Liddell-Scott for classical Greek, forever tied, as it were, with little Alice of Alice in Wonderland. For German, Grimm's Wörterbuch, and Dr Adam Wrede for his priceless Neuer kölnischer Sprachschatz. Monier-Williams' Sanskrit Dictionary, even if he did crib some from the St Petersburg dictionary. I have always coveted a Du Cange.

Ceci n'est pas un seing.