1876, as a biological term, "union for life of two different organisms based on mutually benefit," from Greek symbiosis "a living together," from symbioun "live together," from symbios "(one) living together (with another), partner, companion, husband or wife," from assimilated form of syn- "together" (see syn-) + bios "life" (from PIE root *gwei- "to live"). Given a wider (non-biological) sense by 1921. An earlier sense of "communal or social life" is found in 1620s. A back-formed verb symbiose is recorded from 1960.
Middle English -ik, -ick, word-forming element making adjectives, "having to do with, having the nature of, being, made of, caused by, similar to," from French -ique and directly from Latin -icus or from cognate Greek -ikos "in the manner of; pertaining to." From PIE adjective suffix *-(i)ko, which also yielded Slavic -isku, adjectival suffix indicating origin, the source of the -sky (Russian -skii) in many surnames. In chemistry, indicating a higher valence than names in -ous (first in benzoic, 1791).
In Middle English and after often spelled -ick, -ike, -ique. Variant forms in -ick (critick, ethick) were common in early Modern English and survived in English dictionaries into early 19c. This spelling was supported by Johnson but opposed by Webster, who prevailed.
Others are reading
Definitions of symbiotic from WordNet
used of organisms (especially of different species) living together but not necessarily in a relation beneficial to each;