steroid ster·oid (stěr'oid', stēr'-)
Any of numerous naturally occurring or synthetic fat-soluble organic compounds having as a basis 17 carbon atoms arranged in four rings and including the sterols and bile acids, adrenocortical and sex hormones, certain natural drugs such as digitalis compounds, and the precursors of certain vitamins. Also called steroid hormone . adj. ste·roid·al (stĭ-roid', stě-)
Relating to or characteristic of steroids or steroid hormones.
The next year, Bonds's offensive production reached even higher levels, breaking not only his own personal records but several major league records. In the Giants' first 50 games in 2001, he hit 28 home runs, including 17 in May—a career high.  This early stretch included his 500th home run hit on April 17 against Terry Adams of the Los Angeles Dodgers .   He also hit 39 home runs by the All-star break (a major league record), drew a major league record 177 walks, and had a .515 on-base average, a feat not seen since Mickey Mantle and Ted Williams over forty years earlier. Bonds's slugging percentage was a major league record .863  (411 total bases in 476 at-bats), and, most impressively, he ended the season with a major league record 73 home runs. 
AP reports that a federal grand jury is investigating whether Barry Bonds committed perjury when he testified in 2003 that he never used steroids. The panel has been hearing evidence for more than a month about whether Bonds lied to a different grand jury that was investigating the BALCO scandal. The existence of the grand jury was first reported by CNN and the San Francisco Chronicle. The personal surgeon for Bonds was subpoenaed to testify before the grand jury, The Chronicle reported. Dr. Arthur Ting, the physician who treated Bonds for the knee injury that kept him out for most of the 2005 season, was subpoenaed to appear before the grand jury at the . District courthouse in San Francisco later in the month, according to two sources familiar with the investigation.