REENTRANT
reentrant, re-entrant
(adjective) (of angles) pointing inward; “a polygon with re-entrant angles”
Source: WordNet® 3.1
Etymology
Adjective
reentrant (not comparable)
Reentering; pointing inward.
(programming, of a mutual exclusion mechanism) Such that the corresponding lock can be reacquired by the locking thread.
(programming) That may be executed more than once at a time either by different threads, or because of recursion.
(transport, of a part of a rocket) Designed to return to the Earth's atmosphere.
(physiology) Of or pertaining to reentry (in the heart)
(music, of a ukulele or similar instrument) Having the strings not ordered according to pitch (having a re-entry)
Noun
reentrant (plural reentrants)
An angle or part that reenters itself.
One who enters (the labour market, etc.) again.
(geography) A valley between a pair of parallel ridges
Source: Wiktionary
Re*ën"trant (-trant), a.
Definition: Reëntering; pointing or directed inwardds; as, a re angle.
Source: Webster’s Unabridged Dictionary 1913 Edition