/proh'beuh sid"ee euhn, -bo-, proh bos'i dee"euhn/ , adj.
1. pertaining to or resembling a proboscis.
2. having a proboscis.
3. belonging or pertaining to the mammals of the order Proboscidea, characterized by a flexible trunk formed of the nostrils and upper lip, large tusks, a massive body, and columnar legs, comprising the elephant and the now-extinct mammoth and mastodon.
n.
4. a proboscidean animal.
Also, proboscidian .
[ 1825-35; Proboscide ( a ) order name (L proboscid- (s. of proboscis PROBOSCIS) + -ea, neut. pl. of -eus adj. suffix; see -EOUS) + -AN ]