BACILLUS
Ba*cil"lus, n.; pl. Bacilli (. Etym: [NL., for L. bacillum. See
Bacillarle.] (Biol.)
Defn: A variety of bacterium; a microscopic, rod-shaped vegetable organism.
BACK
Back, n. Etym: [F. bac: cf. Arm. bak tray, bowl.]
1. A large shallow vat; a cistern, tub, or trough, used by brewers, distillers, dyers, picklers, gluemakers, and others, for mixing or cooling wort, holding water, hot glue, etc. Hop back, Jack back, the cistern which receives the infusion of malt and hops from the copper. — Wash back, a vat in which distillers ferment the wort to form wash. — Water back, a cistern to hold a supply of water; esp. a small cistern at the back of a stove, or a group of pipes set in the fire box of a stove or furnace, through which water circulates and is heated.
2. A ferryboat. See Bac, 1
BACK Back, n. Etym: [As bæc, bac; akin to Icel., Sw., & LG. bak, Dan. bag; cf. OHG. bahho ham, Skr. bhaj to turn, OSlav. b flight. Cf. Bacon.]
1. In human beings, the hinder part of the body, extending from the neck to the end of the spine; in other animals, that part of the body which corresponds most nearly to such part of a human being; as, the back of a horse, fish, or lobster.
2. An extended upper part, as of a mountain or ridge. [The mountains] their broad bare backs upheave Into the clouds. Milton.
3. The outward or upper part of a thing, as opposed to the inner or lower part; as, the back of the hand, the back of the foot, the back of a hand rail. Methought Love pitying me, when he saw this, Gave me your hands, the backs and palms to kiss. Donne.
4. The part opposed to the front; the hinder or rear part of a thing; as, the back of a book; the back of an army; the back of a chimney.