say it: dee
d is a noun and adjective meaning "a fat-soluble vitamin that prevents rickets". It carries 4 recorded senses.
a fat-soluble vitamin that prevents rickets
the cardinal number that is the product of one hundred and five
the 4th letter of the Roman alphabet
denoting a quantity consisting of 500 items or units
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for d come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.