a. 保持的, 有保持力的, 记性好的

Retentive \Re*ten"tive\, a. [Cf. F. r['e]tentif.]
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.


Retentive \Re*ten"tive\, n.
That which retains or confines; a restraint. [R.] --Bp. Hall.