What is the meaning of Puer?

Dung (of dogs, fowls, etc) used in tanning, after applying lime, to soften skins.

Alternative form of pu'er

Ellipsis of puer aeternus.

to stink, to smell (bad)

to stink of

pure

a child; chit

a boy, lad (typically between ages 7-14 but could be younger) (older than an īnfāns but younger than an adulēscēns)

a male servant or page; slave

a bachelor

boyhood (ex: in puero, "in his boyhood" or "as a boy")

few, some, a few

pharmacist apprentice

student dressed up for comedy

Source: wiktionary.org