Webster's Revised Unabridged Dictionary -- Volume AB

Æs·thet"ic (?), Æs·thet"ic·al (?), a. Of or Pertaining to æsthetics; versed in æsthetics; as, æsthetic studies, emotions, ideas, persons, etc.

-- Æs·thet"ic·al·ly, adv.

Æs`the·ti"can (?), n. One versed in æsthetics.

Æs·thet"i·cism (?), n. The doctrine of æsthetics; æsthetic principles; devotion to the beautiful in nature and art. Lowell.

Æs·thet"ics, Es·thet"ics (?; 277), n. [Gr. ? perceptive, esp. by feeling, fr. ? to perceive, feel: cf. G. ästhetik, F. esthétique.] The theory or philosophy of taste; the science of the beautiful in nature and art; esp. that which treats of the expression and embodiment of beauty by art.

Æs`tho-phys`i·ol"o·gy(?), n. [Gr. ? to perceive + E. physiology.] The science of sensation in relation to nervous action. H. Spenser.

Æs"ti·val (?), a. [L. aestivalis, aestivus, fr. aestas summer.] Of or belonging to the summer; as, æstival diseases. [Spelt also estival.]

Æs"ti·vate (?), v. i. [L. aestivare, aestivatum.]

1. To spend the summer.

2. (Zoöl.) To pass the summer in a state of torpor.

[Spelt also estivate.]

Æs`ti·va"tion (?), n.

1. (Zoöl.) The state of torpidity induced by the heat and dryness of summer, as in certain snails; -- opposed to hibernation.

2. (Bot.) The arrangement of the petals in a flower bud, as to folding, overlapping, etc.; prefloration. Gray. [Spelt also estivation.]