perdu
1 of 2noun
per·du ˈpər-(ˌ)dü 
-(ˌ)dyü;
(ˌ)pər-ˈd(y)ü
variants or perdue
obsolete
: a soldier assigned to extremely hazardous duty
perdu
2 of 2adjective
per·du per-ˈdᵫ
variants or perdue
: remaining out of sight
Word History
Etymology
Noun
French sentinelle perdue, literally, lost sentinel
Adjective
French perdu, masculine, & perdue, feminine, from past participle of perdre to lose, from Latin perdere
First Known Use
Noun
1608, in the meaning defined above
Adjective
1612, in the meaning defined above