octavinA single-reed instrument with a conical bore, originating in Germany.
octavinaA stringed musical instrument resembling the guitar.
octavingAn audio effect in which a signal is combined with another version of itself that is an octave higher or lower.
octaviusA male given name from Latin, in occasional use.
octavoA sheet of paper 7 to 10 inches (= 17.78 to 25.4 cm) high and 4.5 to 6 inches (= 11.43 to 15.24 cm) wide, the size varying with the large original sheet used to create it. It is made by folding the original sheet three times to produce eight leaves.
octavofinalA match or game between two of the last sixteen competitors in a given tournament or sporting competition.
octavolateraloctaval and lateral: Used exclusively to describe a structure in the brains of fishes, namely the medial octavolateral nucleus or the dorsal octavolateral nucleus, both analogus to the mammalian cerebellum.
octenalAny of several isomeric unsaturated aliphatic aldehydes having eight carbon atoms and one double bond.
OctlantisAn area of Jervis Bay, New South Wales, Australia, where gloomy octopuses (Octopus tetricus) are known to congregate. A colony of octopi and their constructed dens built out of scallop shells.
octletA word (or rather, a doubleword) consisting of eight bytes (64 bits)
OctoberA type of ale traditionally brewed in October.
OctoberfestThe Bavarian holiday (Oktoberfest or Wiesn), or any such holiday, celebrated in late September to early October, typically featuring German music, cuisine, and beer-drinking as prominent activities.
OctoberingA naming ceremony in the early Soviet Union meant to serve as an irreligious and Marxist alternative to christening.
OctoberishResembling or characteristic of the month of October.
OctoechosA liturgical book containing a repertoire of hymns ordered in eight parts according to the eight echoi (tones or modes), used in many rites of Eastern Christianity.
octoicPertaining to, derived from, or resembling octane; used mostly to designate any of a group of acids including caprylic acid.
octoidBeing a form of gear or tooth that resembles the involute, but whose complete path of contact on the surface of a sphere is in the form of a figure eight.
octonionAn 8-dimensional nonassociative extension of a quaternion with a real part and 7 imaginary parts (each a real multiple of a distinct square root of −1).
octophobiaThe irrational fear of the number eight.
octophoneA modern stringed instrument intended to be able to play the tone combinations of the tenor guitar, tenor banjo, ukulele, taro-patch fiddle, tiple, mandolin, mandola and mandocello.
octopianOf, pertaining to, or resembling an octopus; octopuslike.
octopicOf, pertaining to, or resembling an octopus; octopuslike.
octopineAn analog of lactic acid, derived from the amino acids arginine and alanine, first isolated from the muscle tissue of octopus species.
octoploidhaving eight complete sets of chromosomes in a single cell