One of the mysteries of the English language finally explained.
Writing instruments consisting of a pen and inkhorn, especially as formerly carried by professional clerks; (hence) these implements viewed as symbolic of pedantry, bookishness, learnedness, etc. Now rare (historical in later use).
Late 16th century; earliest use found in Claudius Hollyband (fl. 1573–1583), linguist and writer. From pen + and + ink-horn.
pen and inkhorn/ˌpɛn(ə)n(d)ˈɪŋkhɔːn/
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