"retentive" in the adjective sense
1. retentive, recollective, long, tenacious
good at remembering
"a retentive mind"
"tenacious memory"
2. retentive
having the capacity to retain something
3. retentive
having the power, capacity, or quality of retaining water
"soils retentive of moisture"
Source: WordNet® (An amazing lexical database of English)
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