dromedary
Origin
From Middle English dromedari, dromedarie (“dromedary; any camel”) [and other forms], from Old French dromedaire, from Late Latin dromedārius (“kind of camel”), from Latin *dromadārius, from dromas, dromadis (“dromedary”) + -ārius (suffix forming nouns denoting agents of use). Dromas and dromadis are derived from Ancient Greek δρομᾰ́ς (dromắs, “running; dromedary”), an ellipsis of δρομὰς κάμηλος (dromàs kámēlos, “running camel”), from δρόμος (drómos, “race, running; race course, track”), ultimately from Proto-Indo-European *drem- (“to run”).
dross
Origin
From Middle English drosse, dros, from Old English drōs, from Proto-Germanic *drōhs (“dregs, sediment”). Also compare Old English drōsna, drōsne (“a ground, sediment, lees, dregs, dirt, ear wax”), from Proto-Germanic *drōhsnǭ, *drōhsnō (“dregs, sediment”), derived from *drōhs. Alternatively, this may be from *dragjō + *-snō (“yeast, sediment”; compare *dragjō (“yeast”)), as if from *drēcg + -sn. Ultimately from Proto-Indo-European *dʰrā́ks (“sediment, yeast”). Cognate with Scots dros, drose, drosse (“small particles, fragments, dross”), Middle Dutch droes (“dregs”), Dutch droesem (“dregs”), German Drusen (“lees, dregs”), Latin fracēs (“grounds or dregs of oil”). Related also to drast, dregs.
drowse
Origin
The verb is either: * a back-formation from drowsy, which is attested earlier; or * possibly from Middle English *drousen (no known attestations), from Old English drūsan, drūsian (“to droop, sink; to become feeble, inactive, low, or slow, drowse”), from Proto-Germanic *drūsijaną (“to look down; mourn”) (possibly merged with *dreusaną (“to fall”)), from Proto-Indo-European *dʰrewHs- (“to break off; to fall down”). The noun is derived from the verb. cognates * Danish drøse (“to be negligent; to slow down”) * Dutch drozen (“to doze; muse”) * German trauern (“to mourn, be sad”) * Gothic 𐌳𐍂𐌹𐌿𐍃𐌰𐌽 (driusan, “to fall; to fall down”) * Norwegian døse (“to drowse”) * Old English drēosan (“to fall; to perish; to rush”) (whence Middle English dresen (“to fall down”)) * Swedish drösa (“to be slow”)