labral a. [L. labrum, lip] 1. (ARTHRO: Insecta) Pertaining to the upper lip. 2. (MOLL: Gastropoda) Pertaining to the outer lip of a shell.
labropalatum n. [L. labrum, lip; palatum, roof of mouth] (ARTHRO: Insecta) In Diptera, the oral surface of the labrum of mosquitoes; a division of the palatum. see clypeopala-tum.
labrum n.; pl. -bra [L. labrum, lip] 1. A lip or edge. 2. (ARTHRO: Chelicerata) In Araneae, has been incorrectly used for the labium. 3. (ARTHRO: Crustacea) The unpaired outgrowth arising in front of the mouth and often covering it; upper lip. 4. (ARTHRO: Insecta) The upper lip located below the clypeus and in front of the other mouth parts. 5. (ARTHRO: Trilobita) The hypostoma of a trilobite fossil. 6. (ECHINOD: Echinoidea) A flap of the interambulacrum which projects over the ventral peristome.
labrum-epipharynx (ARTHRO: Insecta) The mouth part representing the labrum and epipharynx.
lac n. [Skr. laksa] (ARTHRO: Insecta) A yellowish or reddish-brown resinous substance secreted by a homopterous scale insect in the family Kerridae (=Tachardiidae, Lacciferidae), important commercially as lac or shellac for varnishes, as sealing wax, and as insulating material in electrical work, cultivated in India, Ceylon and Burma; also has a medicinal use in Mexico.
lacerated a. [L. lacer, torn] Having edges jagged or irregular.
lacinia, lacinea n.; pl. laciniae [L. lacinia, flap] 1. (ARTHRO: Crustacea) The inner distal spiny lobe of the second segment of the maxillula. 2. (ARTHRO: Insecta) a. In many, the inner lobe (elongate jaw-like structure) of the maxilla, located at the apex of the stipes. b. In Psocidae, represented by a hard elongate rod, slightly bifurcated at its free end and ensheathed by the galea, sometimes called the pick; similar modification to a stylet-like shape in Mallophaga.
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