American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Ungrazed heather does eventually become overgrown and 'senile', but this leads to the opening up of patches of ground that become colonised by other plant and then tree species, eventually leading to more natural communities, such as rowan, ash and acid oak woodlands.— Life and style | guardian.co.uk
Send your problems to Rowan - rowan. pelling@dailymail.co.uk— Home | Mail Online

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about twice a year.