peculiar (adj.) Look up peculiar at Dictionary.com
mid-15c., "belonging exclusively to one person," from Latin peculiaris "of one's own (property)," from peculium "private property," literally "property in cattle" (in ancient times the most important form of property), from pecu "cattle, flock," related to pecus "cattle" (see pecuniary). Meaning "unusual" is first attested c.1600 (earlier "distinguished, special," 1580s; for sense development, compare idiom). Related: Peculiarly.