from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix Of, relating to, or characterized by: seismic.
- suffix Having a valence higher than that of a specified element in compounds or ions named with adjectives ending in -ous: sulfuric acid.
- suffix One relating to or characterized by: academic.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix Used to form adjectives from nouns with the meaning "of or pertaining to";
- suffix Used to denote certain chemical compounds in which a specified chemical element has a higher oxidation number than in the equivalent compound whose name ends in the suffix -ous. For example sulphuric acid (H2SO4) has more oxygen atoms per molecule than sulphurous acid (H2SO3).
from the GNU version of the Collaborative International Dictionary of English
- A suffix signifying, in general, relating to, or characteristic of
- A suffix, denoting that the element indicated enters into certain compounds with its highest valence, or with a valence relatively higher than in compounds where the name of the element ends in -ous. It is also used in the general sense of pertaining to.
Middle English, from Old French -ique, from Latin -icus and from Greek -ikos.(American Heritage® Dictionary of the English Language, Fourth Edition)
From French -ique, from Latin -icus, from Proto-Indo-European *-ikos, *-iḱos, formed with the i-stem suffix *-i- and the adjectival suffix *-ko-. Cognates include Ancient Greek -ικος (-ikos), Sanskrit श (-śas), क (-kas) and Old Church Slavonic -ъkъ (ŭkŭ). (Wiktionary)