Hexapoda \Hex*ap"o*da\, n. pl. [NL., fr. Gr. "e`x six + -poda.]

(Zool.) The true, or six-legged, insects; insects other than myriapods and arachnids. [1913 Webster]

Note: The Hexapoda have the head, thorax, and abdomen differentiated, and are mostly winged. They have three pairs of mouth organs, viz., mandibles, maxill[ae], and the second maxill[ae] or labial palpi; three pairs of thoracic legs; and abdominal legs, which are present only in some of the lowest forms, and in the larval state of some of the higher ones. Many (the Metabola) undergo a complete metamorphosis, having larv[ae] (known as maggots, grubs, caterpillars) very unlike the adult, and pass through a quiescent pupa state in which no food is taken; others (the Hemimetabola) have larv[ae] much like the adult, expert in lacking wings, and an active pupa, in which rudimentary wings appear. See Insecta. The Hexapoda are divided into several orders. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Hexapoda

Source: WordNet (r) 2.0
 

Hexapoda \Hex*ap"o*da\, n. pl. [NL., fr. Gr. "e`x six + -poda.]

(Zo["o]l.) The true, or six-legged, insects; insects other than myriapods and arachnids.

Note: The Hexapoda have the head, thorax, and abdomen differentiated, and are mostly winged. They have three pairs of mouth organs, viz., mandibles, maxill[ae], and the second maxill[ae] or labial palpi; three pairs of thoracic legs; and abdominal legs, which are present only in some of the lowest forms, and in the larval state of some of the higher ones. Many (the Metabola) undergo a complete metamorphosis, having larv[ae] (known as maggots, grubs, caterpillars) very unlike the adult, and pass through a quiescent pupa state in which no food is taken; others (the Hemimetabola) have larv[ae] much like the adult, expert in lacking wings, and an active pupa, in which rudimentary wings appear. See Insecta. The Hexapoda are divided into several orders.

Source: Webster's Revised Unabridged Dictionary (1913)