The Collaborative International Dictionary
Oil of spike
Spike \Spike\, n. [Cf. G. spieke, L. spica an ear of grain. See Spikenard.] (Bot.) Spike lavender. See Lavender.
Oil of spike (Chem.), a colorless or yellowish aromatic oil extracted from the European broad-leaved lavender, or aspic ( Lavendula Spica), used in artist's varnish and in veterinary medicine. It is often adulterated with oil of turpentine, which it much resembles.
Wiktionary
oil of spike
n. (context chemistry English) An aromatic oil extracted from the European broad-leaved lavender, or aspic (''Lavendula spica''), used in varnish and in veterinary medicine.