| dah | (noun) the longer of the two telegraphic signals used in Morse code | Synonyms: dash |
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| dahl | (noun) small highly nutritious seed of the tropical pigeon-pea plant | Synonyms: cajan pea, pigeon pea |
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| (noun) tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics | Synonyms: cajan pea, Cajanus cajan, catjang pea, dhal, pigeon-pea plant, pigeon pea, red gram |
| dahlia | (noun) any of several plants of or developed from the species Dahlia pinnata having tuberous roots and showy rayed variously colored flower heads; native to the mountains of Mexico and Central America and Colombia | Synonyms: Dahlia pinnata |
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