One of the mysteries of the English language finally explained.
Of or relating to the family Pinaceae, which comprises the pines, firs, spruces, etc. Also generally: piney (rare).
Mid 19th century; earliest use found in Thomas Moore (1821–1887), gardener and writer on horticulture. From scientific Latin Pinaceae, family name (J. Lindley Nat. System Bot (ed. 2, 1836) 313; from Pinus, genus name (from classical Latin pīnus) + -aceae: see -aceous) + -ous.
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