adv. 25B6; adverb MOREOVER, further, what's more, also, additionally, in addition, besides, as well, too, to boot, on top of that, over and above that, into the bargain, by the same token; archaic withal.
FURTHERMORE
Meaning of FURTHERMORE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012