mid-15c., "to poison" (obsolete), from Medieval Latin intoxicatus, past participle of intoxicare "to poison," from in- "in" (from PIE root *en "in") + Latin toxicare "to poison," from toxicum "poison" (see toxic). Meaning "make drunk" first recorded 1570s (implied in intoxicated). Figurative sense "excite to a high pitch of feeling" is attested from 1590s. Related: Intoxicating.
"to intone, recite in a singing voice," 1795, from Medieval Latin intonatus, past participle of intonare "sing according to tone" (see intone). Compare Italian intonare, French entonner. Related: Intonated; intonating.
obsolete 17c.-18c. verb, from French entoner "thunder, roar, resound, reverberate," from Latin intonare "to thunder, resound," figuratively "to cry out vehemently," from tonare "to thunder" (see thunder (n.)). Related: Intoned; intoning.
"to make into scrap, consign to a scrap-heap, break up (machinery) into scrap-iron," 1883 (in reference to locomotives), from scrap (n.1). Related: Scrapped; scrapping; scrappable.
early 15c., from Old French investigacion (14c.), from Latin investigationem (nominative investigatio) "a searching into, a searching for," noun of action from past participle stem of investigare "to trace out, search after," figuratively "search into, investigate," from in- "in, into" (from PIE root *en "in") + vestigare "to track, trace," from vestigium "a footprint, a track" (see vestige).
1650s, "to trace the origin of;" also "to bring into existence, give rise or origin to," probably a back-formation from origination. Intransitive sense of "to arise, come into existence" is from 1775. Related: Originated; originating.
1859 (implied in segmented), "divide or become divided into segments," in reference to cell division, from segment (n.). Transitive sense, "divide (something) into segments" is from 1872. Related: Segmenting.