[ok-tad] /ˈɒk tæd/
a group or series of eight.
Chemistry. an element, atom, or group having a valence of eight.
a group or series of eight
(chem) an element or group with a valency of eight
[ok-tuh-dek-uh-noh-ik, ok-] /ˈɒk təˌdɛk əˈnoʊ ɪk, ˌɒk-/ noun, Chemistry. 1. .
[ok-tuh-gon, -guh n] /ˈɒk təˌgɒn, -gən/ noun 1. a polygon having eight angles and eight sides. /ˈɒktəɡən/ noun 1. a polygon having eight sides n. 1650s, from Latin octagonos, from Greek oktagononos, literally “eight-angled,” from okta- comb. form of okto “eight” (see eight) + gonia “angle,” related to gony “knee” (see knee (n.)). Also octogon […]
[ok-tag-uh-nl] /ɒkˈtæg ə nl/ adjective 1. having eight angles and eight sides. /ɒkˈtæɡənəl/ adjective 1. having eight sides and eight angles 2. of or relating to an octagon adj. 1570s, from octagon + -al (1). octagon (ŏk’tə-gŏn’) A polygon having eight sides. octagonal adjective (ŏk-tāg’ə-nəl)
noun 1. a type of American house, c. 1850, having an octagonal perimeter to reduce exterior wall area.