contraoctave (4) | (noun) - against + eight = the musical octave begining on the third C below middle C. |
four-line octave (5) | (noun) - four line + eighth = the musical octave starting with the third C above middle C. |
great octave (5) | (noun) - great + eighth = the musical octave starting on the second C below middle C. |
high-octane (2) | (adj.) - high + eight + -ane = a high octane gasoline, i.e.
having a high octane number and good antiknock properties; high-powered. |
isooctane (4) | (noun) - equal + eight + -ane = a flammable liquid used in
determining the octane number of fuels. |
octagon (3) | (noun) - eight + angle = a polygon of eight angles and eight sides.
Octagonal is the adjective form and octagonally is the adverb form. |
octahedron (4) | (noun) - eight + face = a solid with eight plane faces. Plural can be octahedrons or octahedra. |
octal (3) | (adj.) - eight + -al = relating to base eight, a number system with a base of eight. |
octameter (5) | (noun) - eight + measures = a line of verse with eight metrical feet. |
octane (2) | (noun) - eight + -ane = any of several isomeric liquid alkanes, C8H18; related to the octane number. . |
octane number (2) | (term) - eight + -ane + number = a number used to measure the antiknock properties of gasoline, the higher the number the smaller likelihood of knocking; also called octane rating. |
octant (4) | (noun) - eight(ths) + circle = an instrument for observing altitudes of a star or planet from a ship or aircraft; the eight sections into which a space can divided by three perpendicularly crossing planes. |
octapeptide (5) | (noun) - eight + digest = a protein fragment or molecule which consists of eight amino acids linked in a polypeptide chain. |
octave (2) | (noun) - from the Latin word = a stanza of eight lines; the whole series of notes or tones, which form the modern scale; an 8-day period of festivities starting on a festival day. |
octavo (5) | (noun) - eighth = a piece of paper cut eight from a sheet; or a book, page, or paper this size. |
octet (3) | (noun) - from the word = a group or set of eight; a group of eight performers; a musical composition for eight instruments or voices. |
octillion (4) | (noun) - eight + -illion (as in million) = the number 1027 or 1,000,000,000,000,000,000,000,000,000. |
octodecillion (5) | (noun) - eighteen + -illion = the number 1057 or
1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000. |
octogenarian (3) | (noun) - eight + genarian = a person in their eighties. Octogenarian is also the adjective form. |
octopus (1) | (noun) - eight + foot = any of the genus Octopus which have eight arms with two rows of suckers; something resembling an octopus. |
octopod (4) | (noun) - eight + foot = any of an order Octopoda, sea animals such as an octopus, which have eight arms bearing suckers. Octopod is also the adjective form. |
octoroon (5) | (noun) - eight + -roon = a person of one-eighth black lineage. |
octosyllable (4) | (noun) - eight + syllable = a word (e.g. o-ver-op-ti-mis-ti-cal-ly) or line of eight syllables (e.g. Humpty Dumpty sat on a wall). |
octothorp (5) | (noun) - eight + thorp = the name for the symbol #. |
octuplets (4) | (noun) eight + plets = eight children (human or other animal) born at the same time! |
subcontraoctave (5) | (noun) - below + against + eighth = the musical octave beginning on the fourth C below middle C. |
trisoctahedron (5) | (noun) - three + eight + face = a solid, such as a crystal, with 24 faces meeting on the edges of a regular octahedron . |
yocto- (5) | (prefix) - yotta- + octo- = the metric prefix for one septillionth (10-24 ), or 0.000,000,000,000,000,000,000,001.
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