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Webster 1913 Edition

Noun.

(Bot.)

A blue-flowered labiate plant (

Brunella vulgaris

); the healall.

Noun.

[self and heal.] A plant of the genus Sanicula, and another of the genus Prunella.

See also: selfheal

self-heal ‎(third-person singular simple present self-heals, present participle self-healing, simple past and past participle self-healed)

(intransitive) To heal itself, or by itself.
- 2015, Sally J. Shim, Be Mine: 25 Paper Projects to Share the Love (page 18)
  A self-healing cutting mat has a durable vinyl surface that bounces back from blade marks and cuts […]