grandissimus
A latin-esque name for the gigantic dong of a whale. Whales are big, so their junk is big too, so big, in fact, that you might describe it as "grand" even.
"Look at the sailor, called the mincer, who now comes along, and assisted by two allies, heavily backs the grandissimus, as the mariners call it, and with bowed shoulders, staggers off with it as if he were a grenadier carrying a dead comrade from the field. Extending it upon the forecastle deck, he now proceeds cylindrically to remove its dark pelt, as an African hunter the pelt of a boa. This done he turns the pelt inside out, like a pantaloon leg; gives it a good stretching, so as almost to double its diameter; and at last hangs it, well spread, in the rigging, to dry. Ere long, it is taken down; when removing some three feet of it, towards the pointed extremity, and then cutting two slits for arm-holes at the other end, he lengthwise slips himself bodily into it. The mincer now stands before you invested in the full canonicals of his calling. Immemorial to all his order, this investiture alone will adequately protect him, while employed in the peculiar functions of his office." - Herman Melville, Chapter 95 "The Cassock," Moby-Dick