attero

Etymology
From, derived from +.

Adjective

 * 1) apterous, wingless
 * 2)  apteral without lateral columns

Etymology
From.

Verb

 * 1) to wear away, rub away
 * 2) to grind
 * 3) to chafe
 * 4) to weaken or impair; to attrit
 * 1) to weaken or impair; to attrit