RHOMBOIDEUS Meaning of RHOMBOIDEUS in English [ rɒm'bɔɪdɪəs ]■ noun ( plural rhomboidei -dɪʌɪ ) Anatomy a muscle connecting the shoulder blade to the vertebrae.OriginC19: mod. L., from ~ (musculus) (see rhomboid ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004