2. (Zoöl.)

Defn: A sheath which surrounds the base of the lasso cells in the
Siphonophora.

INVOLUNTARILY
In*vol"un*ta*ri*ly, adv. Etym: [From Involuntary.]

Defn: In an involuntary manner; not voluntarily; not intentionally or willingly.

INVOLUNTARINESS
In*vol"un*ta*ri*ness, n.

Defn: The quality or state of being involuntary; unwillingness; automatism.

INVOLUNTARY
In*vol"un*ta*ry, a. Etym: [L. involuntarius. See In- not, and
Voluntary.]

1. Not having will of the power of choice.

2. Not under the influence or control of the will; not voluntary; as, the involuntary movements of the body; involuntary muscle fibers.

3. Not proceeding from choice; done unwillingly; reluctant; compulsory; as, involuntary submission.