Defn: Having ten columns in front; — said of a portico, temple, etc.
— n.

Defn: A portico having ten pillars or columns in front.

DECASYLLABIC Dec`a*syl*lab"ic, a. Etym: [Pref. deca- + syllabic: cf. F. décasyllabique, décasyllable.]

Defn: Having, or consisting of, ten syllables.

DECATHLON
De*cath"lon, n. [See Deca-; Pentathlon.]

Defn: In the modern Olympic Games, a composite contest consisting of a 100-meter run, a broad jump, putting the shot, a running high-jump, a 400-meter run, throwing the discus, a 100-meter hurdle race, pole vaulting, throwing the javelin, and a 1500-meter run.

DECATOIC
Dec`a*to"ic, a. (Chem.)

Defn: Pertaining to, or derived from, decane.

DECAY
De*cay", v. i. [imp. & p. p. Decayed; p. pr. & vb. n. Decaying.]
Etym: [OF. decaeir, dechaer, decheoir, F. déchoir, to decline, fall,
become less; L. de- + cadere to fall. See Chance.]

Defn: To pass gradually from a sound, prosperous, or perfect state, to one of imperfection, adversity, or dissolution; to waste away; to decline; to fail; to become weak, corrupt, or disintegrated; to rot; to perish; as, a tree decays; fortunes decay; hopes decay. Ill fares the land, to hastening ills a prey, Where wealth accumulates and men decay. Goldsmith.