The Collaborative International Dictionary of English v.0.48:

Harm \Harm\ (h[aum]rm), n. [OE. harm, hearm, AS. hearm; akin to
   OS. harm, G. harm grief, Icel. harmr, Dan. harme, Sw. harm;
   cf. OSlav. & Russ. sram' shame, Skr. [,c]rama toil, fatigue.]
   1. Injury; hurt; damage; detriment; misfortune.
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   2. That which causes injury, damage, or loss.
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            We, ignorant of ourselves,
            Beg often our own harms.              --Shak.

   Syn: Mischief; evil; loss; injury. See Mischief.
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The Collaborative International Dictionary of English v.0.48:

Harm \Harm\, v. t. [imp. & p. p. Harmed (h[aum]rmd); p. pr. &
   vb. n. Harming.] [OE. harmen, AS. hearmian. See Harm, n.]
   To hurt; to injure; to damage; to wrong.
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         Though yet he never harmed me.           --Shak.
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         No ground of enmity between us known
         Why he should mean me ill or seek to harm. --Milton.
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WordNet (r) 3.0 (2006):

harm
    n 1: any physical damage to the body caused by violence or
         accident or fracture etc. [syn: injury, hurt, harm,
         trauma]
    2: the occurrence of a change for the worse [syn: damage,
       harm, impairment]
    3: the act of damaging something or someone [syn: damage,
       harm, hurt, scathe]
    v 1: cause or do harm to; "These pills won't harm your system"