1540s, "standing out above a surface," from Latin extantem (nominative extans), present participle of extare "stand out, be visible, exist," from ex "out" (see ex-) + stare "to stand," from PIE root *sta- "to stand, make or be firm." Sense of "in existence" attested in English by 1560s. Related: Extance; extancy, both 17c., both obsolete.
extant manuscripts
exquisite
exsanguinate
exsert
exsiccate
exsiccation
extant
extemporaneous
extemporary
extempore
extemporize
extend