RETENTIVE
retentive
(adjective) having the power, capacity, or quality of retaining water; “soils retentive of moisture”
retentive, recollective, long, tenacious
(adjective) good at remembering; “a retentive mind”; “tenacious memory”
retentive
(adjective) having the capacity to retain something
Source: WordNet® 3.1
Etymology
Adjective
retentive (comparative more retentive, superlative most retentive)
Having power to retain
(slang, apocope) anal-retentive
Noun
retentive (plural retentives)
(obsolete) That which retains or confines; a restraint.
Source: Wiktionary
Re*ten"tive, a. Etym: [Cf. F. rétentif.]
Definition: Having power to retain; as, a retentive memory.
Nor airless dungeon, nor strong links of iron, Can be retentive to
the strength of spirit. Shak.
Re*ten"tive, n.
Definition: That which retains or confines; a restraint. [R.] Bp. Hall.
Source: Webster’s Unabridged Dictionary 1913 Edition